On the RetroPie version of RA, there is an option for “core options -> enhanced resolution (slow)”. I can’t find this anywhere on the RA 1.7.0 PC version. I am on Win 10. And trying all of the PSX cores, but spending most of my time on PCSC ReARMed. How can I increase the resolution (beyond just smoothing) and have it apply only to that emulator or that platform?
PCSX-ReARMed only supports increased resolution on ARM hardware, IIRC, as it uses the NEON extensions to do it.
You really shouldn’t use that core outside of ARM hardware unless you have a specific reason to do so. On x86/64, use Beetle-PSX instead.