Amazing how good this emulator is now for the PS3.
It's not quite up to Dolphin levels of quality, but it genuinely isn't that far off:
Working my way through Demon's Souls again at the moment in smooth 4K/60Hz loveliness.
https://rpcs3.net/blog/2019/08/12/new-d ... fps-patch/
Does require a lot of CPU grunt to run though (GPU is almost irrelevant, just as long as it's reasonably modern and supports Vulkan ideally), to get 4K performance I have to clock all cores on my Ryzen 2700 to 4.1Ghz and it'll easily max out eight threads. For native 720p a modest 3400G will run most playable titles fine at 30fps.
Performs better on Linux vs Windows also due to the scheduling.