I have a similar setup to you. 3080ti i7-10700 32gb. Quest 2 via Virtual Desktop.
First I’d read this:
this is the only hack (really a fix) that I’ve ever found makes a material difference. OpenXR toolkit was useful pre-DLSS but doesn’t work for me now.
Then the question is really what you mean my a good frame rate. Using the latest beta and DLSS balanced, with most settings mid/high/ultra, TLOD c150 I get min framerate c27 (New York) but easily 30+ anywhere else, c40 in rural areas. I don’t think its perfect (eg the view when yawing the aircraft when taxiing is a bit nauseating) and there’s the odd hang (rather than stutter) which I think is streaming related.
But I don’t think 4k series is essential.