All rumors and FUD at this point !
source : "We want to apologize for the confusion around our most recent GF100 update. To clarify, the" and scroll down to the bottom of the comments.
Harrison Fleetwood asks Nvidia : "So is everything on the net relating to these cards just rumours? One rumour has come up saying the 480 runs hot and power consumption is as much as a 5970."
"@Harrison. Hi, yes, all rumors and FUD at this point. And Sam, yes, I agree. Although, it will be fun to look back at all of the rumors and FUD after the launch event and see exactly how far off base all of these stories are."