From the pcsx2 wiki:
“Harware requirements are very game-dependant although it must be noted that the bottleneck of this emulator in most cases is the CPU rather than than the GPU (video card): basically, a faster CPU should net you better PCSX2 performance”
A good videocard still helps alot (especially if you want higher resolution) but I think the CPU is more often the limiting factor. Nvidia cards seems to get better performance in Batocera but AMD cards still work fine.
I would check the Single Thread Performance for the cpu, above 1500 should get you ok performance for most games. Would recommend more than 2000 to be sure.