I would say all of them here is overclocked I7 lga1366 total system load stress test with CF 6950 509watts http://www.anandtech.com/show/4061/amds-radeon-hd-6970-radeon-hd-6950/24
real gaming load 470watts.
I didn't know 5870 consumes more power than 6870. That's alot
By the way, why isn't crysis pushing as much as furmark?
As long as graphic cards can't run games more than 60fps, doesn't that mean they are already at their max limit?