Is it possible to game over a thunderbolt 3 connection from my desktop that's in another room? If so, how would that work? Would my gtx970 render the game and send that data to the Thunderbolt expansion card in my desktop which would then be transfered to my thunderbolt hub?
Linus did a video on the subject. i sugest you check that out.
You can buy a thunderbolt hub with video and usb to run your mouse, keyboard and display. Then yes run a lead to another room.
he's doing it on a thunderbolt 2 card whick iirc is 20gbps and tb3 is 40