Hey, I was just wondering about this, as im getting a 7900GT stepup soon. My PSU worked fine with the 6800GS at 520/1200 and my 3500+ running at 2.4Ghz. Since the 7900GT uses slightly LESS power, should i be ok? Thanks!
yeah you shud be fine the 7900gt takes around the same power , bcuz of its lower manufacturing process
In theory you should be fine, yet I've heard of lots of people with 7900GTs having problems that were solved after changing the PSU. If it has nice +12V line amps I guess you should be fine.
You didn't post your PSU specs in your profile. I don't think that 20A versus 19A will matter. They do pad their specs to make sure than there is a very wide safety marging. I also think you should be fine since the card your getting will draw less power (that means less on the 12V line) than your current card.