-Under Windows OS with Support for USB-C Video, you can use up to 2 extended video display with this hubs Display Port +HDMI.
*You must make sure your computer USB-C port support Display Alternate mode, due to a large variant of windows pc, please consult with your manufacturer to see if your USB-C port support Dual Video out in extended mode with USB-C hub.
-Mac OS can only connect to 1 extended video display (or 2 mirrored displays) via this hub (Mac OS limitation).
The Difference is on the Limitation is due to MAC utilizing SST over MST on Windows:
On The Mac OS with Intel's processor lineup supports DisplayPort 1.3. Macs with DisplayPort 1.3, will be able to drive a 5K display over Single-Stream Transport (SST), eliminating the need for Apple to worry about syncing two channels over Multi-Stream Transport (MST).
- 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.