Hi everyone, this is my first post here. The debate is interesting, so here's my take.
I have read quite a few debates on GPU and RAM performance, but not so much on CPU. Now its understood that a PC cannot be compared to console, but we can be start somewhere. Here's a link showing how a 7870 performs as CPU varies:
http://www.tomshardware.com/reviews/cpu-performance-comparison,3370-16.html
Now these are Tom's hardware CPU charts but fortunately were using a 7870 as GPU. If we take 3dmark11 as an example, it scales all the way from about 1700 to 6500 marks as the CPU gets better. Now the question where do we place the PS4 Jaguar on this? Well here's another link which tries to estimate the Jaguar performance
http://www.redgamingtech.com/amd-jaguar-ps4s-cpu-vs-pc-desktop/
He essentially estimates that a Jaguar would be about, very generously, 3600 passmarks. I don't know how passmark estimates or whether this equivalence is realistic, but still, the guy sounds reasonable. So take 3600 passmarks, and we can find that a i5-750s is about there(
http://www.cpubenchmark.net/high_end_cpus.html).
Now see the 3dmark11 score of i5-750s in first link and you get a score of 4600 marks.
So for a PC with Jaguar CPU and 7870 we can estimate 4600 3dmarks. Considering that a 7870 scales all the way up 6500 marks, this is about 70% utilisation.
Now if you read statements that the CUs in PS4 are 14-4 split, 14 for Graphics usage and 4 for general (GPGPU stuff?), then this seems to make sense, i.e. rest of the PS4 hardware is not enough to push the GPU to the limit. Myabe its only enough to use 14 fully for graphics.
Coming Xbox One, MS says it has balanced hardware. How does this sound?