[Solved] Will I have enough bandwidth for various ports over the USB-C on the graphics card?

[MJ1]

USB-C port on the back of the GPU Expansion Bay module is DisplayPort video out plus basic USB 2.0 data.

MUX Switch?

The USB-C port on the Graphics Module supports DisplayPort Alt Mode along with basic USB 2.0 functionality. The intent of it is to basically be a physically small DisplayPort output connected directly to the GPU.