In general you want to avoid Nvidia if you want to play games on Linux, but maybe things will get better.
Isn’t pop_os shipping ancient components at this point due to their hate brained idea to try and create their own de and pinning their next release to it?
RDR is now working fine on Pop_OS with Proton 10.x.
i play rdr1 via proton on opensuse + amd and i get better frames than windows