This should give you a pretty good idea. For example, Cyberpunk seems to run pretty well which is impressive considering how buggy the game can be even on Windows. Proton has been an excellent experience for me so far... And you can use it for non-steam games. It's just a fork[0] of Wine with DXVK and some other Wine "extensions" baked in.

[0] https://github.com/ValveSoftware/Proton

Also good luck buying a new GPU in the next 4 years :)