Well, yes i understand that
But u get my point
I mean, yea if u want to stay in the efficiency sweet spot of 60-80% then get a 850/1000 watt for UR system (or 2 295s)
U could probably run that on a 650 (try the Signature
) but it would be a very high load :X
But i mean...700/800 for 2 GTS 250s?!