FYI, I followed this guide as well and am able to get ~40 FPS with (IMO) better clarity than TAA at full resolution in the reverb g2 with my 9900k and 3080ti. Key is to use DLSS Performance but then super sample by a huge margin in the OpenXR Toolkit. It makes absolutely no sense (i.e. even with DLSS, with the super sampling I’m now rendering at the resolution behind the scenes that I was getting 20 fps at before) but it works perfectly lol.
