Ed, Thanks. Guess I am out of luck. The numbers are

3.3v = 18a
5v = 22a
12v = 14a

Would 5900XT work?

I'm sorry to jump in here, but if you don't have enough for a 6600GT your
certainly won't have enough for a 5900XT as far as I know.
The power requirement is actually lower for the 6600GT then most of the other
fast video cards such as 5900, 6800, 9800Pro etc....etc. I'm going by some
reviews I have read for the 6600GT which mentioned a power requirement of 300
watts. Most of the other cards are around 350 watts.