PC specs priority to improve emulation?

So, i just want to upgrade my PC, and having a good machine for decent emulation is one of the reasons i'd like to upgrade. But what do i actually need mostly? Much RAM, a good GPU, or a CPU? If i need a top-tier CPU, which spec in priority? Number of cores, Processor frequensy, CPU-techologies? And what about AMD/Intel specific CPU/GPU? does RPCS3 work good on both brands, or there're some issues?

Or there're no specific requirements, and i have to upgrade just anything?