They did announce that it would mainly just be benchmark testing raw CPU power, which I think is why they advised people to downclock their GPU's and stuff - because it would actually make the performance more unstable. Was quite strange to see it not using 100% CPU power, though. My framerate was shocking as a result, particularly during moments that were heavy on post-processing effects, for e.g. when leaving water and going onto land, the water droplets on the screen would drop me down to 5fps (i5 760 4Ghz).
Yeah i got the same with water droplets upon leaving the water and that is with an i5 2500k @ 4.6 and using 30/40% of my CPU power.
It really didn't work very well from what I could tell. When questing near water on water-mobs, even sometimes submerging my character up to its shins would result in water droplets on the screen. Pretty silly.