- On Windows devices that support USB-C for video, you can use up to two additional video outputs through extended mode with this Hub.
- An important note: Due to a large variety of Windows computer models and specifications, you need to make sure that USB-C port/ports on the computer support Display Alternate mode with MST. Please contact the manufacturer of your computer to make sure this is supported.
- MacOS devices can only connect to one extended video display, or two mirrored displays, through this Hub. This is a MacOS limitation.
Why can't I use two displays on a Mac computer?
The reason has to do with the technologies for display used in MacOS computers vs Windows computers. Mac utilizes Single Stream Transport (SST), while Windows allows for Multi-Stream Transport (MST) on most devices:
- What is SST and MST? In order to achieve 4K resolution at 60Hz, most early 4K displays on the market used Multi-Stream Transport (MST), a technology that stitches two halves of a display together into one large surface -- also called a "tile" -- in software. MST, supported on Thunderbolt 2 Macs, can carry a signal for two or more monitors on a single cable, allowing for daisy-chaining or hub configurations of multiple 4K monitors.
More recent 4K displays have started using Single-Stream Transport (SST), eliminating the need for stitching two halves of a display together in software. Instead, SST monitors feature scalers that support 4K resolution at 60 Hz over a single tile. Ideally, if you are purchasing a 4K display, you should look for one that supports SST, since MST can cause issues with in-game menus, BIOS screens, and scaling.
On Mac OS with Intel's processor lineup, it supports DisplayPort 1.3. Macs with DisplayPort 1.3, will be able to drive a 5K display over SST, eliminating the need for Apple to worry about syncing two channels over MST.