and I got 299W, which is well below my 420w psu. Following the PSU 101 guide, I then chose only the cpu, vid card, hard disk, and optical drive (all on the 12v rail). I got 218w, divided by 12 to get 18.167 amps. This is almost exactly my psu output. Will I be fine with this upgrade? Thanks for the help.
Thanks for the quick reply. Unfortunatly, I would rather not upgrade if I have to buy a new PSU. Since my friend desperately needs a video card, I'm looking into other possible cards I could upgrade to. I took a look at the 7900 GS and 7600gt. I used that site again to calculate the 12v amp, and I get 16.42 for the 7900, and 15.67 for the 7600gt.
Would getting the 7900gs be risky, or are both fine?
and while I agree that a better psu is a good idea, remember that those calculations are based on all of the components running at max at the same time, this can happen during gaming of couse but it won't be the case for any other time.