Heh, with that kind of power consumption, nvidia may as well throw a "SLI certified power supply required" logo on the card. I wouldn't attempt to touch fermi with a power supply rated under 700W.
Performance looks to fit the rumors. With high enough levels of AA/DX11, it crushes the 5870. (it has more memory though right? some of those big wins might just be the 5870 running out of memory)
At more reasonable settings (1680x1050 or 1920x1080), it just barely edges out the 5870. And it looks like nvidia had to really crank up the core speed and voltage to get that.
Interesting to see fermi's performance vary as much from benchmark to benchmark as a dual gpu card. Sometimes its way out ahead, sometimes it's on par. I'd love to see a system with two of these, it should be able to run insane settings.