11-02-2017, 11:49 PM -
i78700k is the best CPU you can get for RPCS3 at the moment. It has 6 cores and 12 threads and a base clock speed of 3.70GHz. As for the GPU GTX 1070 and above would be good enough for 4k with RPCS3 but not for PC games. For PC games you would need a SLI setup to enjoy games at 4K.