The 8800 GT actually requires less power than a lot cards out now. It only wants 400w and 26A. I'm guessing it probably has a lower power requirement than his old 7800 does.
EVGA | Products
400w psu with 22A for a single card
450w psu with 24A for SLI mode.
Note, this is for the SSC version which is the highest clocked version.