So they basically skimped out on cpu at the beginning of the gen, changing architecture would give all sorts of compatibility issues and now all they can do is slap a decent heatsink on it and overclock a little.
I see no other reason for that cpu-gpu disparity, higher res is the only thing they can chase despite 99% of homes being stuck on 1080p 60hz displays, and they arent going for the 60hz.
that goes for pissPro as well