fullmetall :
Corsair.
GTX 295 - 750w and up.
I have the GTX295 from the date it released Jan 8 with a corsair HX620W and I do not have any problems, is very stable and extremely fast (as expected).
The whole system use 470-500W at full load (CPU + GPU).
This card needs recommended power supply with +12 Volt current rating of 46 Amp Amps and Corsair HX620W have 50 Amp Amps so it is more than fine.
hentaiboi_ do not listen to this people, the Corsair HX620W is capable for a GTX295.