MECtallica wrote:
you're going to want 36+amps on the 12v rail
No he isn't. That's way more than he needs. You only need a total of 30A on the combined 12V rails for a GTX a GTS requires much less - at peak usage it draws about 13-16A (compared to the GTXs 18-20A).
His PSU may well be fine. 400W is very often perfectly sufficient for an 8800GTS. I've run one on a crappy 380W Antec one for a little while and even a dirty QTEC PSU, no issues either time, though didn't do any OCing.
Don't listen to the inevitable PSU lies. Everyone always seems convinced you need 100000000000000W PSUs to run any sort of high end GPU, it's not true.
A lot of people are chatting a lot of rubbish on this thread. This always seems to happen when threads about Crysis pop up. As has been mentioned, a 7800GTX can run Crysis at highish medium settings, DX10 cards will have an advantage, not only in graphical splendour, but also in speed. DX10 mode is much quicker. An 8800GTS should run Crysis nicely at high settings, probably not absolutely maxed out, but certainly at high settings.