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DisplayPort Multi-Stream Transport (MST) carries more than one display stream over a single DisplayPort connection. It can give a compatible computer an extended desktop across several monitors through a daisy chain or an MST hub. The number of displays, resolutions and refresh rates depends on the computer, connection and displays, rather than a universal four-screen limit.
MST versus SST and mirroring
| Term | What it means for your desk |
|---|---|
| SST — Single-Stream Transport | One display stream on the DisplayPort link |
| MST — Multi-Stream Transport | Several independent streams share one link, when the source and software support them |
| Mirroring | Displays show the same desktop; this alone does not prove you have independent MST desktops |
| Extended desktop | Displays provide separate workspace, so a window can move from one screen to another |
DisplayPort’s multi-display guide shows the two common MST layouts: a monitor chain or a hub. An ordinary HDMI splitter that repeats one picture is not a substitute for independent MST outputs.
What you need before connecting monitors
- A compatible source: check the computer or graphics-card specification for MST and the maximum number of active displays.
- A suitable connection: DisplayPort, Mini DisplayPort or USB-C carrying DisplayPort video. A USB-C connector alone does not confirm video or MST support.
- A hub or daisy-chain monitor: the first monitor in a chain needs an MST-capable DisplayPort input and a DisplayPort output. The last display only needs a compatible input.
- Supported software: the GPU driver and operating system must support the intended extended-display arrangement.
DisplayPort’s official overview describes MST as multiple display streams from one source. A hub with HDMI outputs converts those streams for HDMI displays; HDMI monitors do not need their own DisplayPort output.
Daisy chain or MST hub?
| Arrangement | Connection | Check first |
|---|---|---|
| Daisy chain | Computer → first monitor → next monitor | DisplayPort Out and MST settings on each intermediate monitor |
| MST hub | Computer → hub → separate monitor cables | Hub output types, external power and supported display combinations |
| Thunderbolt dock or chain | Computer → Thunderbolt device → displays | The exact computer and dock’s display support; this is not interchangeable with every ordinary MST hub |
How bandwidth limits the setup
All MST streams share the upstream link. Higher resolution, refresh rate and color depth consume more bandwidth. Link rate, available USB-C lanes, compression support and hub capabilities also matter. Two displays that work at 60 Hz may not both work at 144 Hz through the same hub. Do not apply a fixed “1080p uses 22%” rule across different connections.
On a USB-C dock, concurrent USB data and video can affect the available display bandwidth. Compare the manufacturer’s supported combinations with your desired resolution and refresh rate before buying.
Windows, Linux and Mac compatibility
MST is not limited to Windows 7–10. Compatible Windows and Linux graphics stacks can use it, subject to hardware and driver support. For a Mac, check the exact Mac model and the hub vendor’s extended-display compatibility: an ordinary DisplayPort MST hub may mirror its outputs rather than create separate desktops. Supported Thunderbolt display chains are a different configuration. Apple’s display-connection guidance is the starting point for a Mac setup.
Set up and troubleshoot the chain
- Connect the computer to the first monitor or powered hub with an appropriate cable.
- Connect the remaining displays. Enable MST or the required DisplayPort mode in the first monitor’s menu if its manual requires it.
- Open the operating system’s display settings, choose extended mode and arrange the screens to match your desk.
- If a screen is missing, test it directly, then lower refresh rate or resolution and reconnect the hub. Check source display limits before replacing cables.
Keep the graphics driver and operating system current using our Windows, macOS and Linux update guide. A black screen during startup is a separate problem; our motherboard beep and diagnostic guide explains how to investigate a failed POST.
Frequently asked questions (FAQ)
What is DisplayPort Multi-Stream Transport?
MST carries several display streams over one DisplayPort link. With a compatible computer, hub or monitor chain, it can provide separate desktop space on multiple screens. The displays share the connection’s available bandwidth.
Does every USB-C port support MST?
No. The port must carry compatible DisplayPort video, and the computer, operating system and hub must support the intended setup. A USB-C connector alone does not confirm video output or MST support.
Why does an MST hub mirror both monitors on a Mac?
macOS does not use an ordinary DisplayPort MST hub to create the same independent extended desktops that a compatible Windows setup can. Dell documents this difference in its daisy-chain compatibility guide. Changing a cable or pressing Extend cannot add unsupported operating-system functionality.
For multiple Mac displays, check the exact Mac’s supported display count and a supported Thunderbolt or separate-output setup. A Thunderbolt dock is not automatically equivalent to a USB-C MST hub, and a hub cannot raise the Mac’s overall display limit.