I think that 16a is sufficient on the 12v rail. However I got a lot of issues with my 7900GT when i first got it because of a crappy psu(which later died). I had artifacting in games and desktop etc. Try the card in another machine and if it does the same thing its likely a problem with the card.
Thanks guys, I tried what you said and had no success but I found that if I went into device manager and unticked the "let computer turn this device off to save power" they work fine,:) although, i cant understand why this happened in the first place as I was playing a game at the time. :dead:
I've been having this problem for a while now, all but 2 of my USB ports have stopped working. The front panel connecter USB ports wont work and neither will 2 of the 4 ports at the back of the pc.
It happened while playing Prince of Persia a while ago, I had my mouse, keyboard and gamepad...
Looks like they are difficult to set-up.
BTW. For downgrading from 2.71, i'm sure you need a special file that has been run 1.5 psp user, does anyone know about this?
Have you checked your card was seated properly? Have you tried it in your computer since? Try it in another pc and see how it runs.
I dont think the 6800XT would be a good buy as its worse than the 6800nu. It doesnt really matter which manufacturer you go with but BFG, ASUS and XFX are all...