refrence 285's in sli are still 529 watts in sli (see same link i linked before)
thats still only 221 watts headroom for the reso of the system with a 750, btu a 850watt-1k watt psu would be fine
The techreport article you linked shows Total System Power, not just the cards in the graphics. "Power consumption
We measured total system power consumption
at the wall socket using an "
In the places I have seen :
"In this article, HotHardware takes an in depth look at the brand new NVIDIA GeForce GTX 285 ... Max board power has been reduced to 183 watts
, from 236 watts on the 280"
And Wiki has it listed as 204 watts. :-P (<-- sorry had to add that in hehe)