I had 3080 prior to 6900xt, but it was almost 8 months ago so maybe my experience would be different today with all drivers updates. But back in December 2020 situation was like this: With 6900xt I was getting more FPS than 3080, but at the same time frame times with 3080 were more consistent. Also motion smoothing (index) and motion reprojection (g2) was pretty much unusable on 6900xt. Looking back for VR I'd keep my 3080. If'd by shoping for GPU today it would be 3080 ti