What is MST and SST
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, 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.