Still on Zotac Mini 1080 ti. Same as @Century don’t see a real point to upgrading to RTX. 1080 ti = approx RTX 2080 save 1080 ti has 3 xtra Gigs ram.
FFR is possible on earlier GPUs. Have to look but Oculus has several types. Including an option to use elements of monoscopic rendering, special Added Mask option. So content to wait & see how pimax does when they have time to explore.
Sure RTX will have an edge as it should with extra goodies built in. But like OpenGL has proven you don’t need DirectX to make things look great (Doom & other ID games demonstrate)