It's supposedly made by Seasonic, but I've read that they can fail after 6 months or so, but since mine started up reasonably well, I hope it lasts. I understand it's a heat issue. I'm not taxing the system now and I have a heatpipe for the CPU and a 120mm exhaust fan, and can add an intake fan in the front.
It has 42 amps combined on the 3 rails, and that's enough above an 8800GTX, but I'm still thinking of the 8800GTS 640 just to play it safe. I'll be getting the new card on October 15. Ideally, I want the PSU to not be overtaxed, but I want the best I can afford in time for the holiday DX10 titles.
Right now, my 3DMark06 score is 2238 with the 7600GS. I hope to see better in the fall. I also upgraded the CPU from the original 3800+ Windsor to a 4600+. I can always use the 3800+ in another computer. It seemed like 2.4 gigahertz was the true entry level for games on an Athlon X2.
you can see my spec from my signature and I'm running it on 550w psu and every week or so I get a power shortage message during post, I just need to reset again to get it up but it shows the psu is starting to struggle. if your plannin big upgrades anytime soon then get a bigger one. 700 odds maybe