It’s a great game and I’m so glad I finally got to play it.
I’m running a RTX 2070 Super and a Ryzen 5 3600 with 32 gigs of RAM. Using Xenia-Canary I could run the game at 1080p with decent framerate, but that caused some really unpleasant brightness issues at night, so I stuck with 720p and honestly stopped noticing the low resolution after a while. The game ran at a stable 60 all the way to the end and I encountered absolutely no issues besides some flickering shadows once or twice.
If you have a decent gaming PC and have never played the original RDR I strongly recommend you try this. It can be a bit of a faff to find what emulator settings work for you, but once you get it working properly, it’s an absolute blast. RDR still holds up really well in my opinion.
Consider using FSR to scale from 720 to 1080; I’m not sure about Windows / Nvidia but it’s built in to Steam Deck and I use it to play on a 1080 monitor without the performance hit.