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Plugable USB-C or USB 3.0 Quad HDMI Adapter
$119.00 USD
SKU: USBC-768H4Amazon Rating : (226 Reviews)
Features
- Add 4 Screens—The Plugable quad monitor adapter lets you add 4x HDMI screens through a single USB-C or USB 3.0 port, all with a sharp resolution of 1920x1080@60Hz
- USB to HDMI Adapter—Perfect for multitasking, extend your work across 4x screens. Easily switch between USB-C and USB 3.0 with included adapter so you can connect to USB4, Thunderbolt 4, Thunderbolt 3, USB-C, or USB 3.0
- Quad Display—On Macs add 4x monitors, even on M1 / M2 / M3 / M4 MacBooks that would otherwise only support one. On Windows machines, add 4x monitors, or add two adapters can be added to connect up to 8 screens. Driver installation is required
- Compatibility—Windows 10 / 11, and macOS 11+. Ideal for web and productivity apps like Google Docs, or Windows Office. Not recommended for gaming, graphics-intensive or design work Doesn't support playback of HDCP-protected content on sites like Netflix and Hulu
- 2-Year Coverage, Lifetime Support—Every Plugable product, including this multi monitor adapter, is covered against defects for 2 years and comes with lifetime support. If you ever have questions, contact our North American-based team - even before purchase
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You’re just trying to add screens to your computer. It shouldn’t be complicated. Sure, adding one screen—no problem. Adding two screens? Still not that hard, but now you have to consider your graphics card and how many external monitors your computer will natively support. A MacBook with an M1 / M2 / M3 / M4 chip, for instance, only supports one. And adding four external monitors? Your options are a high-end docking station, or a handful of dongles and adapters coming out of every open port on your machine.
The USB-C or USB 3.0 to Quad HDMI Adapter (USBC-768H4) changes that. Now you can add four HDMI screens through a single USB-C or USB 3.0 port—all with a sharp 1920x1080@60Hz image, even on M1 / M2 / M3 / M4 Macs.
Big Results
Smaller than you might expect for a quad display adapter, this multiple monitor adapter still manages all of the heavy lifting involved with delivering your video signal across four monitors. But it’s how the adapter handles the task of parceling the pixels across your screens that’s interesting.
A lot of adapters rely on USB-C features not available on all systems. The USBC-768H4 uses a Silicon Motion chipset and a software driver to accomplish the task. From a user perspective, there isn’t much of a difference. Unless, of course, you happen to be on an M1 / M2 / M3 Mac. Those particular computers don’t support more than 1 Alt Mode display so the standard approach wouldn’t work.
It is worth noting, a driver download is required. On Windows machines, the update is automatic though we do recommend installing the driver manually. On a Mac, however, this is accomplished through the InstantView App. And remember, though they offer similar functionality, the DisplayLink driver won’t work with this adapter.
4 Here, 4 There
A USB to HDMI adapter for monitor expansion opens up new levels of productivity.
Dedicate an entire screen to spreadsheets, email, stocks, or anything else you’re working on.
The USBC-768H4 adapts to your style of multitasking. Use it to expand to one, two, or three screens. It works just as well if you aren’t tapping into all four ports.
Now, let’s talk about what this multi HDMI adapter doesn’t have. It doesn’t have an external power source. It also doesn’t have an unwieldy cord to manage. What it does have is a flat cable that tucks into the bottom of the unit when not in use.
When you’re ready to expand your screen count, flip out the connector and plug it into an open USB-C or USB 3.0 port. Now you just have to connect your four HDMI monitors. That’s it. The adapter will get any required power from the host. And when you’re ready to go, disconnect and toss the adapter in your bag.
Compatibility
The USBC-768H4 is designed to work well with a wide variety of computers.
With the option to connect to the host computer through USB-C or USB 3.0 (USB-C to USB adapter included), you’ll never be left looking for an adapter.
Speaking of adaptability, the Plugable USB-C or USB 3.0 to Quad HDMI Adapter works with Windows 10 and newer, and macOS 11+. And that includes Macs with M1 / M2 / M3 chips that would otherwise only support one external monitor.
Not compatible with ChromeOS.
 |
 |
 |
 |
|
|---|---|---|---|---|
# of Displays |
4 |
2 |
2 |
2 |
Video Ports |
4x HDMI |
2x HDMI |
2x HDMI, 2x DisplayPort |
1x DisplayPort |
Resolution Supported |
1920x1080 @ 60Hz |
1920x1080 @ 60Hz |
4K @ 60Hz |
1920x1080 @ 60Hz |
Connection |
USB 3.0, USB-C, Thunderbolt 3 / 4, USB4 |
USB 3.0, USB-C, Thunderbolt 3 / 4, USB4 |
USB 3.0, USB-C, Thunderbolt 3 / 4, USB4 |
USB 3.0, USB-C, Thunderbolt 3 / 4, USB4 |
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Can I Connect a DisplayPort (DP) Monitor to the HDMI Port on This Device Using an Adapter or Cable?
No. Most DisplayPort to HDMI cables and adapters are one-way adapters from a DisplayPort Source (computer or docking station) to a HDMI Sink (television, computer monitor, or projector). These cables do not work in reverse.
DisplayPort uses packet-based data transmission, breaking the video stream into individual packets of data allows for longer cable runs, use in both copper and fiber-optic cables, and allows for higher bandwidth than other video formats. It is relatively easy to convert from DisplayPort to HDMI (computers with HDMI output ports already do this internally) and dual-mode DisplayPort outputs have built-in adapters to output a HDMI signal for use with passive DisplayPort to HDMI adapters.
HDMI uses a video signal, similar to DVI, this requires more power to operate at the same cable lengths as DisplayPort and requires significantly more processing power to create DisplayPort packet-based data.
Externally powered HDMI to DisplayPort adapters do exist, these generally have a USB or small barrel plug for power, and can convert from a HDMI Source to DisplayPort Sink. In most cases they have reduced resolution or refresh rates compared to modern signal sources and can introduce delay in the data connection between the display and computer potentially causing reduced connectivity or display performance problems.
We do not currently recommend using HDMI to DisplayPort adapter with our docking stations. In our testing they have been unreliable compared to a native DisplayPort connection. Many of our newer docking stations include both HDMI and DisplayPort outputs to reduce the need for additional adapters or adapter cables.
How to Configure/Adjust Multiple Monitors Using a Windows System
We have a produced a series of short videos that introduce the general concepts of multi-monitor setups in Windows, how to make changes to the way things behave, as well as how to solve common problems.
Direct links to the introductory videos our customers have found the most useful are:
- Introduction to Multiple Displays in Windows
- Common Multi-Monitor Problem—Spatial Orientation
- How To Make a Display the ‘Main’ Display in Windows
- Multi-Monitor Problem—Spatial Orientation Part Two
- Introduction to Display Scaling in Windows
We also maintain a playlist that contains all of the multiple monitor tutorial videos we have made .
No Sound? How to Change Your Default Audio Device to Your Plugable Product
Whether you're on Windows, macOS, or Linux, it's common to add new audio devices to your computer.
Some examples of additional audio devices you may want to switch to include:
- Bluetooth headsets, headphones, and speakers
- Speakers built into a display, such as a TV or monitor
- A USB sound card, digital audio converter (DAC), or analog to digital converter (ADC)
- USB microphones
- Audio jacks on a docking station
These steps don't apply to the Plugable Performance NIX HDMI Capture Card (USBC-CAP60).
Here are the steps that you need to set a new default audio recording or output device on different operating systems.
Set Audio Output Device
Set Audio Recording Device
Set Default Playback Device in Windows
- Check that your device is properly connected, and that any necessary drivers are installed
- It is also a good idea to make sure that your sound device is turned on, and that the device's volume control is not at the absolute minimum setting
- Right-click on the speaker symbol in the Windows taskbar/system tray
-
Windows 7/8.x—Select Playback Devices. The Sound window will open with the Playback tab highlighted
-
Windows 10/11—Select Open Sound Settings then click the link under 'Related Settings' for Sound Control Panel, then click the Playback tab
- Alternatively, after selecting Open Sound Settings, use the dropdowns under the Output header
-
Windows 7/8.x—Select Playback Devices. The Sound window will open with the Playback tab highlighted
- Find your device in the window
- A Plugable USB 3.0 docking station or sound-enabled display adapter will appear as Plugable Audio
- A Plugable USB 3.0 Silicon Motion docking station or sound-enabled display adapter will appear as SMI USB Audio
- A Plugable USB 2.0 docking station will appear as USB Multimedia Audio Device
- A Plugable USB Audio adapter will appear as USB Audio Device
- Right-click on the device you found in step 3 and select Set as Default Device. A check mark should appear next to your device, and sound should now play through it
- Click OK to exit the window
Additional Configuration for Bluetooth
Please see our pairing and configuration guide for Bluetooth devices.
Set Default Playback Device in macOS
- Open System Preferences
- Click Sound
- Select Output
- Select the most appropriate device
- A Plugable USB Audio adapter will appear as USB Audio Device
Set Default Playback Device in Linux
- Ensure that you audio device is connected to the PC
- If the audio device is self-powered, it is a good idea to make sure that it is powered on, and that the device's volume control is not at the absolute minimum setting
- Launch the 'Settings' application in your distro
- Go to the 'Sound' option
- Find the dropdown for your 'Output Device', and change it to your preferred output device
- For additional sound device controls, you may want to consider using Pulseaudio Volume Controls (package name pavucontrol)
Set Default Recording Device in Windows
- Check that your device is properly connected, and that any necessary drivers are installed
- It is also a good idea to make sure that your sound device is turned on, and that the device's volume control is not at the absolute minimum setting
- Right-click on the speaker symbol in the Windows taskbar/system tray
-
Windows 7/8.x—Select Recording Devices. The Sound window will open with the Recording tab highlighted
-
Windows 10/11—Select Open Sound Settings then click the link under 'Related Settings' for Sound Control Panel, then click the Recording tab
- Alternatively, after selecting Open Sound Settings, use the dropdowns under the Input header
-
Windows 7/8.x—Select Recording Devices. The Sound window will open with the Recording tab highlighted
- Find your device in the window
- A Plugable USB 3.0 DisplayLink docking station or sound-enabled display adapter will appear as Plugable Audio
- A Plugable USB 2.0 docking station will appear as USB Multimedia Audio Device
- A Plugable USB Audio adapter will appear as USB Audio Device
- Right-click on the device you found in step 3 and select Set as Default Device. A check mark should appear next to your device, and sound should now play through it
- Click OK to exit the window
Additional Configuration for Bluetooth
Please see our pairing and configuration guide for Bluetooth devices.
Set Default Recording Device in macOS
- Open System Preferences
- Click Sound
- Select Input
- Select the most appropriate device
- A Plugable USB Audio adapter will appear as USB Audio Device
Set Default Recording Device in Linux
- Ensure that you audio device is connected to the PC
- If the audio device is self-powered, it is a good idea to make sure that it is powered on, and that the device's volume control is not at the absolute minimum setting
- Launch the 'Settings' application in your distro
- Go to the 'Sound' option
- Find the dropdown for your 'Input Device', and change it to your preferred input device
- For additional sound device controls, you may want to consider using Pulseaudio Volume Controls (package name pavucontrol)
My Docking Station/Adapter Works Well With My Windows Laptop, but When I Close the Lid the Displays and Laptop Turn Off or Sleep. How Do I Fix This?
Most Windows notebook computers power management settings will default to putting the computer to sleep with the lid closed, regardless of any external displays, keyboard, or mouse connected to the computer. If this is happening but you would prefer the system to remain active with the lid closed utilizing the external display or displays, these settings can be changed by performing the following:
For Windows 10:
- Start by right-clicking on the Start button and select Power Options from the menu.
- From the right side of the Power Options settings page, select the blue link for Additional power settings
- From the choices present on the left-hand side of the Power Options window, please click on Choose what closing the lid does
- Make sure the setting for When I close the lid under the Plugged In column is set to Do Nothing
- Click the Save Changes button and restart the system (making sure that the laptop’s power adapter is also connected) and test the behavior again.
For Windows 11:
- Start by right-clicking on the Start button and select Power Options from the menu.
- In the upper left corner of the settings window, in the search box, type "lid" then select Change what closing the lid does from the search results
- Make sure the setting for When I close the lid under the Plugged In column is set to Do Nothing
- Click the Save Changes button to apply the new settings.
Closing the lid should no longer put the computer into sleep mode when an external display and power source is connected, instead one of the external displays should now become the Primary display with the desktop icons instead of the laptop's built-in display.
The lid may still need to be opened to perform the following tasks:
- To power on the computer from a fully powered off state
- To log into the computer if logged out or if the computer is restarted with the lid closed
- To wake the computer from a deep sleep state ( hibernation, or Windows hybrid sleep states )
Silicon Motion InstantView Installation Instructions for macOS 15, 14, 13, and 12
How to install the Silicon Motion InstantView application based on your macOS version.
If you are unsure of the macOS version you are using → Click on the Apple logo in the top left of your mac display and select ‘About This Mac’.
macOS 12.x and newer
***For macOS 10.15 through macOS 11.x please click here***
1. Download the Silicon Motion InstantView application for your version of macOS from here.
2. Double-click on the file you downloaded to start the application installer
3. Drag the macOS InstantView app icon to the Applications icon: (Please be sure to drag the 'macOS InstantView' application to the 'Application' icon inside of the 'macOS InstantView' window itself.)
4. Navigate to your Launchpad or Applications folder to locate the InstantView app and double click to launch it
5. Click Open
6. Click Open System Preferences. Note: this should automatically open the Security and Privacy section, but if it does not you can manually open the Security and Privacy settings
7. Click on the switch to enable screen recording for the macOS InstantView application.
8. If prompted, enter your password and click the ‘Modify Settings’ button:
9. You will be prompted to Quit and Reopen the InstantView application in order for the change to take effect. Please do so:
11. The software has now been installed, and with the release of macOS 15 Sequoia, Apple has instituted a new policy whereby this permission must initially be allowed for one month and then be renewed on a monthly basis. If the permission is not renewed, then the Silicon Motion device will not function.
** Please note - The Silicon Motion InstantView application does NOT in fact record or store any information. This permission must be granted in order for the InstantView application to access the information it needs in order to generate the image shown on the Silicon Motion-connected displays. **
Using the macOS Silicon Motion InstantView Application:
12. Right Click on the InstantView icon that is now present within the Apple Menu bar at the top of your screen. This will reveal the InstantView quick access menu:
13. Click "Display before Login" to enable the Silicon Motion-connected displays to be activated at the macOS Login Screen
14. In order to receive automatic InstantView application updates you can ensure that the Auto Update setting is checked
15. Left click on the InstantView icon within the Apple Menu bar at the top of your screen. This will reveal the InstantView application
16. You can quickly disconnect the displays and you can quickly change your Silicon Motion-connected displays to Mirrored or Extended mode
Why Does Image Quality With My Silicon Motion Graphics Adapter or Docking Station Not Seem As Crisp As My Laptop Screen or Directly Connected External Monitor?
Silicon Motion technology uses the Silicon Motion software driver on Windows and Silicon Motion InstantView application on macOS to generate a "virtual desktop" image that is sent over a USB connection to the adapter. These pixels are rendered by the Silicon Motion chip within the adapter to then send a video image to the connected monitors.
Because of the amount of data being sent the software driver must compress the data being sent so it can pass through efficiently over USB connections. This is why some images may not appear as "crisp" using a Silicon Motion adapter or docking station.
In our testing, Red colors are primarily affected where they can appear pixelated or blurry when viewed closely.
Blue Light Reduction Applications Are Not Working While Connected to my Silicon Motion USB Dock or Adapter
The Silicon Motion driver does not currently support this type of color adjustment. As a result, applications like f.lux, Night Shift or Night Light will not affect displays connected to a Silicon Motion-based docking station or video adapter.
I Can't Use My Intel, NVIDIA, or AMD/ATI Graphics Utility to Manage the Monitors Connected to My Silicon Motion-Based Docking Station/Graphics Adapter. Why?
The graphical software utilities provided by Intel, NVIDIA and AMD/ATI are designed to only recognize and work with graphics adapters made by their respective manufacturers. As a result, they will not recognize USB-attached displays connected to a Silicon Motion-based docking station or graphics adapter.
It is recommended to use the facilities built-in to Windows to manage the connected displays. These would be the ‘Display Settings’ application on Windows 10 and ‘Screen Resolution’ application on Windows 8.1 and 7. Both of these applications are available by right-clicking on empty space within the Windows desktop and selecting the appropriate choice from the context menu that appears.
Why Doesn't the "Display Color Calibration" Tool in Windows Affect the Display(s) Attached to My Silicon Motion-Based Docking Station/Video Adapter?
The Silicon Motion driver does not support color calibration functionality of any kind. Most monitors have built-in controls that can be used to adjust the characteristics of the display, though we realize this approach may not be ideal in all cases. For environments that necessitate near-perfect color reproduction and display calibration capabilities via software, a dedicated graphics card is recommended.
Are Plugable USB Video Adapters or Docking Stations Based on Silicon Motion Technology Compatible With Touchscreens?
Touchscreens that do not require drivers and use the host’s operating system’s built-in USB Human Interface drivers (HID) to record touch inputs can be made to work with our products, however Plugable does not provide support for doing so due the complexity of multi-monitor touch screen setups.
If I Add a Silicon Motion-Based Docking Station or Graphics Adapter to My System, Will That Prevent My System’s Built-In Video Outputs From Working?
No, the Silicon Motion device's presence on your system will not preclude the use of any of your system’s built-in video outputs.
Can I Adjust the Brightness of a Display Connected to My Silicon Motion-Based Docking Station or Video Adapter via the Windows ‘Display Settings’ Application?
Windows does not have the ability to adjust the brightness of a display connected using Silicon Motion technology. We recommend making use of the display’s internal on-screen menu options in order to adjust the display's brightness.
Do Silicon Motion Graphics Adapters and Docking Stations Work on macOS?
Our Silicon Motion-based graphics adapters and docking stations are supported with macOS, albeit with potential limitations that one would expect with a directly connected external monitor.
| Supports closed-display mode (aka clamshell mode) | - No with macOS 10.15 Catalina and macOS 11 Big Sur on Intel-based systems - Yes, with macOS 12+ on Intel-based systems (an external power source must be connected to the Mac) - Yes, with macOS 11+ on Apple M1, M2, and M3-based systems (an external power source must be connected to the Mac) |
| Supports display ‘rotation’ | - No with Intel-based systems. - Yes, with macOS 11+ when using an Apple M1, M2, or M3-based system and when using the Silicon Motion InstantView app version 3.13 R02 or newer. Download available here. |
| Supports macOS ‘Login screen’ | - Yes, by enabling "Display before Login" in the settings menu |
| Supports Blue Light Reduction / Night Shift | - No, Night Shift and other blue light reduction software is not supported |
Applications That Use OpenGL Such As Google Sketchup or Google Earth Do Not Work As Expected When Connected to a Silicon Motion-Based Graphics Adapter or Docking Station
Graphics adapters and docking stations based on Silicon Motion USB video technology are in essence a 'virtual' graphics adapter that relies on the host laptop's CPU and internal physical graphics processing unit (aka as GPU) to generate the information shown on the Silicon Motion-attached displays.
In rare instances, Windows applications that use a technology known as OpenGL to draw the image shown on the display will attempt to direct OpenGL related tasks to the Silicon Motion-based virtual graphics adapter, and not to the 'real'/'physical' GPU within the laptop.
Since the adapter or dock is not a physical GPU that supports OpenGL, this can sometimes cause applications that make use of OpenGL (such as Google Earth or AutoCAD) to not work as expected or result in various types of error messages.
The true root cause of this behavior can vary, and ultimately lies outside of the adapter, docking station or its associated Silicon Motion driver. In some cases the root cause lies within the Windows driver for the host system's physical GPU and in rarer cases within the Windows operating system itself.
In some cases updating either the driver for the system's internal GPU or updating Windows itself (when Microsoft provides such updates) can help, however that is unfortunately not always the case.
If updating those components does not help, in most cases there are two possible workarounds.
The first is to configure Windows to have the ‘Main’ display set to a display directly connected to the host system's built-in internal GPU, whether that is an internal laptop display or another external display connected to one of the system's built-in video outputs (a quick guide to doing so is here -> https://youtu.be/7nnKztRZXsw).
If the first option does not prove a suitable workaround, the second option is to boot the system without the adapter or dock connected, launching the affected application, and then connecting the adapter or dock may also help.
Legacy macOS Silicon Motion Driver Installation Instructions
'Legacy' Silicon Motion Driver installation for macOS 10.14 Mojave
** Before you begin **
If have installed a previous version of the Silicon Motion driver, please uninstall it and then reboot your system before proceeding.
1. Download the latest driver for macOS 10.14 Mojave from here -> Link
2. Navigate to your Downloads folder and double-click on the Silicon Motion driver download
3. The disk image of the driver will mount, and automatically open the Silicon Motion Installer main landing page
4. Double-click on the ‘SMI USB Display Driver Installer.pkg’ file. The SMI USB Display Driver Installer page will open
5. Click ‘Continue’ at the Introduction step
6. Click the ‘Continue' at the Read Me step.
Note: This Read Me step mentions that the Silicon Motion software must be allowed in the macOS Security & Privacy settings - this is an important step starting in Step x of these instructions
7. Click ‘Install’
8. Enter your system password and click the ‘Install Software’ button
10. Click 'Continue Installation'
11. Click on the ‘Open Security Preferences’ button
12. Click the ‘Allow’ button at the bottom of the window to grant permission for the extension to be loaded.
** Important note – this approval must be granted within 30 minutes of the driver installation or the process will not work. A fresh installation must be performed to reset this timer. **
There is also a chance that the warning message about the blocked System Extension will not appear, but macOS may still block the extension. After the driver installation completes, please double-check that the necessary approval was granted by clicking the ‘System Preferences’ icon (the gear) and then clicking on the ‘Security & Privacy’ icon. From the window that appears please ensure the Silicon Motion driver is Approved by clicking the ‘Allow’ button.
12. Close the ‘Security and Privacy’ window. The Silicon Motion installation should now complete
13. You may also elect to move the Silicon Motion driver installer to the Trash Bin by clicking 'Move to Trash' or you may keep it by clicking 'Keep'
'Legacy' Silicon Motion Driver removal for macOS
1. Download the Silicon Motion driver package for macOS 10.14 Mojave from here -> Link
2. Navigate to your Downloads folder and double-click on the Silicon Motion driver download
2. Double-click on the 'SMI USB Display Driver Uninstaller' to begin the uninstallation wizard
3. Click the ‘Uninstall’ button
4. Enter your account password and click ‘OK’
5. After a few moments the process will complete. Click the ‘Restart’ button to complete the removal process.
Can Silicon Motion and DisplayLink-based Docking Stations and Graphics Adapters Work Together?
Yes! As long as the software drivers for both Silicon Motion and DisplayLink-based products are installed on the same computer these two USB graphics solutions can work together and be used at the same time.
My Silicon Motion-based USB Docking Station or USB Video Adapter Is Not Working As Expected
When a Plugable Silicon Motion device is not working as expected with a Windows system, the best practice is to disconnect the device from the host system (and remove it's external power source, if it has one) and perform a manual installation of the latest version we recommend of the required Silicon Motion software driver to help ensure both are in a good state. To do so, please follow these steps:
- Disconnect the Plugable Silicon Motion USB docking station or video adapter from the host system. If the product you are using has an external power adapter (for example a USB docking station), please also disconnect the power adapter from the product so that the unit resets. Please keep everything disconnected until prompted
- Uninstall any and all software with 'Silicon Motion' in the title that is present from within the Control Panel > Programs and Features (Apps and Features in Windows 10). If an entry is not listed in the Programs and Features application, the driver was likely installed automatically by Windows Update. Please then move on to the next step of installing the latest recommended driver
- Once the uninstallation has completed running, restart the host system (even if not prompted to)
- Download and install the latest version (that we recommend) of the Silicon Motion software driver
- If you disconnected the power adapter from your product in step one, please reconnect it so the device powers on, then reconnect the product to the host system. If the product is still not working as expected, please restart the host system one more time.
If, after having completed this process, your Plugable Silicon Motion device is still not working as expected, please reach out to us directly via support@plugable.com with the output of our PlugDebug diagnostic utility and we will be happy to help
Understanding Heat Generation in Electronics
It's not uncommon for users to notice a certain level of heat generation from electronics and by extension, Plugable products during operation. In this knowledge base article, we'll explore the reasons behind this heat generation and why it is considered a normal experience within reasonable limits.
Electronics, by their nature, generate heat during operation. This is primarily a result of the electrical current flowing through various components, such as integrated circuits, transistors, and other electronic elements. As Plugable products are designed to efficiently process and transfer data (among other functionality), some level of heat generation is inherent.
Factors Influencing Heat Generation:
- Power Consumption: The power consumption of a device directly influences the amount of heat it generates. Higher power usage, especially during data transfer or charging processes, can lead to increased heat.
- Enclosure Design: The design of the product's enclosure and its ability to dissipate heat play a crucial role. Adequate ventilation and heat sinks are often incorporated to manage and disperse generated heat effectively. This is evident in our TBT3-UDZ and TBT4-UDZ designs. The metal case in these docks are designed to function as a heatsink with thermal pads placed throughout the enclosure. This allows heat dissipation from inside to the outside, but will also make it feel as if the device is “too hot”.
- Ambient Temperature: The external environment may also play a role. Higher ambient temperatures can contribute to increased perceived heat from the product. This means that summer temperatures may increase the heat generation of not just Plugable products, but many other electronic devices.
Normal Heat Levels: While it is normal for electronic devices to generate heat, Plugable products are engineered to operate within safe temperature ranges. We conduct rigorous testing to ensure that the heat generated during normal operation falls within industry-standard safety parameters. While not all products are or need to be UL certified, we try to go by UL guidelines for thermal readings. The UL threshold is 77C/170.6F, and we aim for around 71C/160F.
Tips for Users:
- Ventilation: Ensure that Plugable products have sufficient ventilation around them. Avoid placing them in enclosed spaces where heat dissipation may be impeded.
- Usage Patterns: Intensive tasks such as high-speed data transfer or charging multiple devices simultaneously may result in increased heat generation. This is generally normal but may be more noticeable in such scenarios.
- Accessories: A number of our devices will allow for the connection of USB accessories and as such, these will require power. If too many “power-hungry” devices are connected, this will cause the device to run much hotter than expected. Be sure to keep in mind the power limits of your dock/device.
In conclusion, experiencing heat from Plugable products is a normal aspect of their operation. Users can rest assured that we prioritize the safety and efficiency of our devices. By understanding the factors influencing heat generation and following simple usage guidelines, users can make the most of their Plugable products while ensuring a reliable and efficient user experience.
Adding Additional Monitors to Expand Any Docking Station or Hub Using Plugable USB Graphics Adapters
A productive work space for technology professionals has much to benefit from adding multiple screens for increased productivity by as much as 42%. Our blog post “Can Multiple Monitors Really Double Productivity” highlights a few different ways to add additional monitors through our USB graphics adapters, docking stations, and USB hubs.
Most docking stations are limited to adding 1, 2, and even up to 4 displays depending on the model. But what if you want to add more monitors without replacing your docking station? Whether you have a Plugable dock – or a dock from Dell, HP, Belkin, Anker, or virtually any other brand – adding USB graphics adapters lets you enable more displays than your current setup would otherwise be capable of.
Both DisplayLink and Silicon Motion with its unique graphics transport technology enables users to add additional monitors through using USB and sparse use of your computer's resources. All you need is an open USB port on your existing docking station or hub and a USB graphics adapter from Plugable.
No matter what type of connection your monitor uses, Plugable has several different types of USB Graphics Adapters that feature HDMI, DisplayPort, DVI, VGA – even combinations with multiple outputs and port types. Our USB Graphics Adapters are available in options for a single display, dual display, and even quad display.
For Windows and Mac users the Plugable USBC-6950U using DisplayLink technology can do precisely this by enabling you to easily add two 4K HDMI or DisplayPort monitors to your computer. The adapter has the flexibility to connect either to a USB 3.0 or USB-C connector. At this time Plugable recommends only a maximum of 8 external monitors on Windows if using 4K resolution monitors with DisplayLink, and a maximum of 4 external monitors with Silicon Motion. This setup is ideal for adding screens for day traders, spreadsheets, and productivity use cases.
On macOS there are limitations to how many external monitors can be supported natively, and this can vary depending on the model of the Mac. With the popular base M1 / M2 / M3* MacBooks, those laptops are limited to only support a single external monitor. Our Plugable USBC-768H4 Quad-HDMI adapter is a great option to exceed this limitation to add up to four 1080p monitors for MacBooks that would otherwise only support a single monitor for a total of 5 monitors.
Curious to see this expandability in action? As a proof of concept Plugable has tested using as many as 14 external monitors using a combination of our DisplayLink graphics adapters and our USB hubs, featured on our YouTube channel.
If you have any questions on setting up a multi-monitor setup, please contact Plugable Support Plugable support.
* Note that the base M3 can output to 2 external displays when the built in screen is disabled or the lid is closed (clamshell mode). This feature is planned for a later date on the base M3 MacBook Pro and is currently available on the M3 MacBook Air.
* Additional SKUs: USBC-6950M, USB3-3900DHE, USBC-6950UE, UGA-HDMI-S, USBC-768H4, UGA-HDMI-2S, UGA-DP-S, USB-VGA-165, UGA-4KHDMI, UGA-4KDP, UGA-3000, UGA-2KHDMI, UGA-165
macOS InstantView and "Screen Recording" Troubleshooting
If you have installed your Silicon Motion-enabled docking station or graphics adapter and downloaded the Silicon Motion software, but see that no displays are working properly, you may need to enable “Screen Recording”. In this guide, we will go over a short list of steps to enable this permission, and get your Silicon Motion device up and running!
As of macOS Catalina (version 10.15), Silicon Motion drivers that are installed require that the “Screen Recording” permission be granted by the user. While this permission, when used in conjunction with Silicon Motion, is not recording in a traditional sense, it does allow the software to access the pixels it needs to render images (mirrored or extended). It then sends these pixels over USB from the computer to the display connected to your Silicon Motion device.
When on your desktop you will see a purple screen icon, this message will appear saying that "macOS InstantView is capturing your screen". No sort of video storage or screen recording is being done by macOS InstantView, it's simply capturing the screen to render images for the additional monitors.
Note: It does not capture or send any data.
When your Mac is on the lock screen, in the menu bar it will show "Your Screen is being observed". This message is simply implying that the macOS InstantView is running in the background.
In the macOS menu bar you will see a Purple square with a person icon, if you select this it will show a message saying "Currently Sharing" this is the macOS InstantView software using the screen sharing API to enable your extended display. There is no recording or sharing of your monitor screen, this is just a generic message that macOS uses when the screen sharing API is being used.
During the installation process for the Silicon Motion drivers, you will be requested to allow “Screen Recording” for macOS InstantView. Additionally, you may see a notification during the macOS InstantView installation process. However, we understand sometimes these may get lost in a sea of information and other notifications.
How do I know if the Screen Recording permission hasn’t been set? Reference the image below to check in your “Privacy & Security” settings
If you have not enabled “Screen Recording”, please follow these few instructions to enable it.
- Click on the Apple icon (defaults to the top left corner of your screen) and select “System Preferences”.
- Navigate to and click “Security & Privacy”.
- In this window, select “Privacy”.
- A list will be presented, scroll until you find “Screen Recording” and click on it.
- Displayed on the bottom left, there is a lock icon, click on this to make changes.
- If prompted, login using your computer credentials to make changes.
- Check the box next to macOS InstantView.
- You will be promoted to “Quit & Reopen”, click this button.
- Click on the lock icon once more to save your changes.
Note: Some of these steps may vary slightly based on your macOS version.
You should now be able to see your displays on your docking station or adapter. If you have completed the above steps successfully and still do not see your displays, please be sure to reach out to our support team at support@plugable.com.
I installed the macOS InstantView Application on my Mac running macOS 15 in order to use my Plugable Silicon Motion-based docking station or video adapter. When I connected my Plugable device to my Mac, I received a prompt to 'Allow' the application for one month. What is this prompt, and what should I do?
In brief, the prompt is part of a new security feature Apple introduced with macOS 15 Sequoia.
For reference, an example of the prompt is included below:
In order to use your Silicon Motion-based product, you must click the ‘Allow For One Month’ button within the prompt you received. In one month’s time, you will be prompted to renew this authorization for an additional month. This renewal process will continue each month thereafter.
To expand further, when initially installed the macOS InstantView Application must be granted ‘Screen Recording’ permission within the macOS Security & Privacy settings in order to function.
*** An important note, the macOS InstantView Application does NOT in fact record or store any information. This permission must be granted in order for the macOS InstantView to access the information it needs in order to generate the image shown on the Silicon Motion driven displays. ***
With the release of macOS 15 Sequoia, Apple has instituted a new policy whereby this permission must initially be allowed for one month and then be renewed on a monthly basis. If the permission is not renewed, then the Silicon Motion device will not function.
How many displays can be added to a computer via USB?
Overview
Modern computers are limited in regard to the number of external displays that can be directly connected or “natively supported.” These limitations are determined by the capabilities of the host computer’s internal graphics processing unit (GPU) and the number of physical video connection ports available.
Products available from Plugable that use technology from DisplayLink or Silicon Motion provide the ability to connect multiple external displays to a computer via USB once the required software driver is installed, which allows one to workaround the host computer’s internal limitations.
Such technologies are typically referred to as ‘indirect display’ technologies because the USB connection means that the displays are NOT connected directly to the host computer’s GPU.
The total number of external displays possible via an indirect display technology can vary due to a number of factors:
- The technical specifications of the host system
- Limitations of the host operating system in regard to how many displays can be addressed
- Limitations of the USB subsystem, in regard to how many devices can be physically connected and recognized by the host system
- The capabilities of the specific indirect display technology in use
Speaking in general, with most modern computers at least four external displays can be added via USB graphics technologies and in some instances up to eight displays are possible. Note these are in addition to the number of native external displays your system supports, which ranges from 1-4 on most modern systems.
Number of indirect displays supported by Plugable
| Windows | macOS | ChromeOS | |
| DisplayLink | 8 - 1920x1080 4 - 3840x2160 |
4 - 3840x2160A | 8 - 1920x1080 4 - 3840x2160B |
| Silicon Motion | 8 - 1920x1080 4 - 3840x2160 |
4 - 3840x2160 | 8 - 1920x1080 4 - 3840x2160 |
A. Total includes any displays added via Apple’s Sidecar feature → https://support.apple.com/en-us/102597
B. Performance is dependent upon the specifications of the host system. Chromebooks using lower-spec CPUs and GPUs may support fewer displays
*** Please see important information within the ‘Performance and Technical Limitations section below ***
Performance and Technical Limitations
When using products based an indirect technology, the number of external displays that can be added to a computer (and are supported by Plugable) will vary depending upon which operating system is in use and certain technical limitations:
Host resource use
An indirect display device is in essence a ‘virtual’ GPU that relies on the capabilities of the host computer’s CPU and physical internal GPU in order to generate the image shown on the attached displays.
With each indirectly connected display added to the host, more CPU and GPU resources are required. As more displays are added, the amount of resource use may impact both the performance and stability of the computer and displays. It should be noted that the resource load will vary depending on the type of content being shown within the indirectly connected displays. For example, static content (such as an office application) will require less resources as compared to dynamic content (such as a video).
USB device connection limit
Modern computers have practical limits in regard to the maximum number of devices that can be connected to the host’s USB subsystem.
These limits will prevent USB devices from being recognized by the host when a certain number of devices are connected.
The total number of USB devices that can be connected can vary from system to system, as well as the specification of the USB protocol in use.
Speaking in general, host computers that supported only USB 2.0 could recognize and use a large number of external USB devices.
Host computers that support USB 3.0 or later versions of the specification have limitations in regard to the number of external devices that can be connected to ensure the level of performance does not drop below a certain threshold.
How To: Set the Display Refresh Rate in Windows 11
Many modern displays can support above the default 60Hz refresh rate, however this may need to be manually set within Windows 11. Please note, not all computers, graphics adapters, and docking stations can support all resolutions and refresh rates.
Setting the Display Refresh Rate in Windows 11
1. Right-click on the desktop and select Display Settings from the drop-down menu
2. Scroll down to the Related settings subsection and select Advanced display
3. At the top of the Advanced display window, select the external display from the drop-down menu
4. From the Choose a refresh rate drop-down menu select the desired refresh rate
Refresh Rate Limitations
With Windows 24H2 and newer, dynamic refresh rates are supported, this allows the system to adjust the display refresh rate to save power, up to the selected refresh rate. As a consequence of this new mode, when selecting the display refresh rate you may see an asterisk. This indicates that selecting the specific refresh rate may reduce the display resolution or image quality in order to prioritize the refresh rate. This exposes the refresh rate option from the display even if the display cable or computer is incapable of supporting that refresh rate at the native resolution and is the intended behavior per Microsoft. [1]
In the screenshot below the left side shows the 4K 120Hz capable display limited to 60Hz refresh rate without asterisks, and on the right the same display after setting the refresh rate to “120 Hz*”, the “Desktop mode” resolution has been reduced to 2560 x 1440 (1440p) instead of 3840 x 2160 (4K UHD). Unlike when using the display scaling option this also causes a reduction in image quality. On the right side asterisks are no longer shown in the refresh rate list. Setting the refresh rate back to 60Hz does not change the resolution, you will have to go back one page and set the resolution manually.
References
[1] Windows Insider description of new behavior (https://blogs.windows.com/windows-insider/2023/08/31/announcing-windows-11-insider-preview-build-25941-canary-channel/)
