Re: 285 GTX - 2gb Version
I think is good enough, my GTX280 worked with a Corsair VX550 (the powersupply was a bit more warmer at finger touch) and in my current computer works very nicely with TX750
(q6600, 2x2 GB ddr2 667, GTX280, Xonar D2, 2x 500GB Seagate 7200.11, 1 dvd reader, 1 dvd writer, mainboard p45-ds3r).
Take into account that when Nvidia says the power supply specs is for a complete system not only for the card :P
DFI PS83-BL, P4 2800 (Bus 533), 512 MB DDR; Gforce3 ti200 128 MB; Audigy, Windows 2000 SP4.