My computer has the following components:
Asus ROG Strix X570-F
G.Skill 32GB (2x16GB) DDR4 3200MHz CL14 Trident
AMD Ryzen 5 3600X
Asus GeForce GTX 1070 Dual OC
EVGA Supernova G3 750W
I did not use a USB extension. I bought a USB extension but did not use it because the displayport cable did not work without a USB extension so I figured it wouldn’t work any better with one. I did try with the extension a few times though and got the same result.
I do not believe it is an issue with the USB ports but rather the cable simply making the displayport total too long at 8 meters. The Rift S seems to not like too long displayport cables.