Found that thread in GAF (http://www.neogaf.com/forum/showthread.php?t=915229) with a summary:
- X1 Marginally faster CPU (due to higher clock speed, 1.6ghz vs 1.75ghz)
- PS4 - Has actually significantly more GPU benchmarking than thought compared to Xbox1, nearly 100% more.
- CPU + GPGPU management is essential and seems no where near optimal this early in the generation.
Full article: http://www.redgamingtech.com/ubisoft-gdc-presentation-of-ps4-x1-gpu-cpu-performance/
Some slides.
The key point is they say bot CPUs are weak and bootleneck to AI processing... weird they can't explain how AI processing can hold the resolution of a game from 1080p to 900p... the bench showed cleary they have a lot of PS4's GPU power to be used.
Have a nice read.