PC Master Race

Hi again! So...based on my previous post, it'd seem that it's going to be quite some headache to get an old intel 6700 CPU with a PCIe 3.0 to work decently with more up to date GPUs (that is, to see a decent improvement in performance at all). I'd like to do a cross-jump to AMD CPUs this time, to be paired with a 6800XT or a 7800XT. I intend to game on Linux, although there will be a Win10 partition for the troublesome games, and also for the Vive Wireless, which is unsupported on Linux. But I've been out of the AMD loop for a while. What's cooking? What would be a good second-to-last generation CPU recommendation or so? Am I missing any important tech if I don't choose the latest and the greatest? Is ReBAR a thing yet? (Not sure if this is the answer to PS5's direct asset streaming from the SSD straight to the GPU). At this point, I'd like to know what CPUs are adviseable, in order to get some idea for a PC build, so I can go get quotes...and see if that's something I'd be able to afford :)