The Plugable USBC-MSTH3 is a USB-C to triple HDMI video adapter that uses DisplayPort Alternate Mode with Multi-Stream Transport (MST) to drive up to three displays from one compatible USB-C, USB4, or Thunderbolt port.
The adapter is designed for compatible Windows 10 or newer and ChromeOS 100 or newer systems. It does not require DisplayLink drivers or other software installation. It uses the host computer's built-in graphics capability, so the maximum number of displays, resolution, and refresh rate depend on the host system's USB-C video support, DisplayPort version, MST support, and available display bandwidth. Plugable lists the USBC-MSTH3 as supporting Windows 10 or newer and ChromeOS 100 or newer on systems with a USB-C, USB4, or Thunderbolt port with video output. Plugable also notes that maximum resolution and refresh rate depend on the host system's video capabilities.
Display Configuration Capabilities
The number and resolution of displays supported depend on the host system's DisplayPort version, MST support, DSC support, and available bandwidth. The connected monitors and HDMI cables must also support the desired resolution and refresh rate.
| Configuration | Max Resolution & Refresh Rate | Requirements |
|---|---|---|
| Single Display | Up to 8K @ 60Hz | HDMI 2.1 monitor and cable required |
| Dual Displays | Up to 4K @ 144Hz | HDMI 2.1 monitors and cables required |
| Triple Displays | Up to 4K @ 60Hz | HDMI 2.0 or newer monitors and cables required |
Note: One HDMI display up to 8K 60Hz, two HDMI displays up to 4K 144Hz, or three HDMI displays up to 4K 60Hz, with maximum resolution and refresh rate dependent on the host system's video capabilities.
System Requirements
To use the USBC-MSTH3, the host system must support USB-C video output through one of the following:
- USB-C with DisplayPort Alternate Mode
- USB4 with DisplayPort support
- Thunderbolt 3 or Thunderbolt 4
A data-only USB-C port is not compatible.
The host system must also support MST for multiple independent extended displays. If a simple USB-C to HDMI adapter does not work with the computer, the USBC-MSTH3 will likely not work either.
Full Compatibility
DisplayPort 2.1
DisplayPort 2.1 systems can support the highest display configurations available through the USBC-MSTH3, including up to one 8K 60Hz display, dual 4K 144Hz displays, or triple 4K 60Hz displays, assuming the monitors and HDMI cables also meet the required specifications.
Limited Compatibility
DisplayPort 1.4 with Display Stream Compression (DSC) - DisplayPort 1.4 systems with DSC can support higher-resolution configurations by using compression. Plugable lists DisplayPort 1.4 with DSC as supporting up to 8K 30Hz, dual 4K 120Hz, or triple 4K 60Hz.
DisplayPort 1.4 without DSC - DisplayPort 1.4 systems without DSC are more limited by available bandwidth. These systems may be limited to dual 4K 60Hz or triple 1080p 60Hz.
Basic Compatibility
DisplayPort 1.2 - DisplayPort 1.2 systems have significantly less available display bandwidth. These systems may be limited to dual 1080p 60Hz or single 4K 30Hz and are not recommended for triple-display use. DisplayPort 1.2 hosts support dual 1080p 60Hz or single 4K 30Hz. Not recommended for triple-display use.
Operating System Compatibility
| Operating System | Compatibility | |
|---|---|---|
| Windows 10 or newer | ✅ Full support | Full extended display support on compatible systems |
| Windows 11 | ✅ Full support | Full extended display support on compatible systems |
| ChromeOS 100 or newer | ✅ Full support | Full extended display support on compatible systems |
| macOS | ❌ Not recommended | macOS does not support MST for multiple independent extended displays through this adapter |
| Linux | ⚠️ Mixed results – not officially supported due to driver inconsistencies | MST behavior can vary by distribution, graphics stack, and driver support |
macOS Note - The USBC-MSTH3 is not recommended for Mac systems. macOS does not support MST for multiple independent extended displays through standard MST adapters. On a Mac, connected displays may mirror instead of extend. Mac systems do not support MST and will only support mirrored displays, not extended or independent displays, with the USBC-MSTH3.
Monitor and Cable Requirements
The host computer is only one part of the display chain. The monitors and HDMI cables must also support the resolution and refresh rate you want to use.
- For 4K 60Hz, use monitors that support HDMI 2.0 and HDMI cables rated for HDMI 2.0.
- For 8K 60Hz, use a monitor that supports HDMI 2.1 and an HDMI cable rated for HDMI 2.1.
Using older, damaged, or lower-spec HDMI cables can result in lower available resolutions, lower refresh rates, flickering, blank displays, or unstable display detection. Plugable notes that 4K 60Hz requires HDMI 2.0 monitors and certified HDMI 2.0 cables, while 8K 60Hz requires HDMI 2.1 monitors and certified HDMI 2.1 cables.
Important Notes:
- The USBC-MSTH3 is a video-only adapter.
- It does not charge the connected laptop.
- It does not provide USB data ports.
- It does not provide Ethernet.
- It does not use DisplayLink technology.
- It does not require DisplayLink drivers.
It uses the host computer's built-in graphics through USB-C DisplayPort Alternate Mode, USB4 with DisplayPort support, or Thunderbolt video output.
Before You Buy Checklist
- The computer runs Windows 10 or newer, Windows 11, or ChromeOS 100 or newer
- The USB-C, USB4, or Thunderbolt port supports video output
- The system supports MST
- The system's DisplayPort version is known
- DSC support is confirmed if triple 4K 60Hz is needed
- The monitors support the desired resolution and refresh rate
- The HDMI cables support the desired resolution and refresh rate
- The user needs extended displays, not mirrored displays
- The system is not a Mac if multiple independent extended displays are required
FAQ
Q: Can I use the USBC-MSTH3 with a MacBook?
A: The USBC-MSTH3 is not recommended for Mac systems. macOS does not support MST for multiple independent extended displays through this type of adapter. Displays may mirror instead of extend.
Q: Will the USBC-MSTH3 charge my laptop?
A: No. The USBC-MSTH3 is a video-only adapter and does not support USB-C Power Delivery pass-through charging.
Q: Does the USBC-MSTH3 require drivers?
A: No. The USBC-MSTH3 is plug and play on compatible Windows and ChromeOS systems. Updated graphics drivers and operating system updates are recommended for best results.
Q: How do I know if my system supports MST?
A: Check the computer manufacturer's specifications for USB-C DisplayPort Alternate Mode, USB4 with DisplayPort support, or Thunderbolt 3/4 support. You may also need to confirm the system's DisplayPort version and whether DSC is supported.
Q: What happens if my system does not support enough display bandwidth?
A: The system may limit the available resolutions, refresh rates, or number of active displays. For example, a lower-bandwidth system may support dual 1080p displays or one 4K display, but not triple 4K 60Hz.
Q: Why does one laptop support triple 4K 60Hz while another does not?
A: The USBC-MSTH3 depends on the host computer's graphics capability, USB-C video support, DisplayPort version, MST support, and DSC support. Two laptops can have the same USB-C connector shape but very different video capabilities.
Still Need Help?
If you have any questions or need help determining compatibility with your system, please reach out to our support team at support@plugable.com.
