Power for 8800GTS 512

If you are not OCing the CPU you are just barely OK. One way to tell is to feel the exhaust air out of the power supply, it should be warm but not getting toward the hot side. If it is, it is under stress. One thing that would help is to make sure your case cooling it top notch so the PS is getting as much cool air as possible at its intake. Most power supplies have their output rated at 25C (warm room temp) and the available output power actually goes down (de-rated) when the working temp of the PS goes up and the caps inside the supply live a lot longer the cooler they are. Even wave a thermometer in the output air stream, if its over 40C that supply is working very hard, over 50C and it will not live long. (These are general statements based on standard engineering/design principles, nothing is for certain, it could work for years, but I doubt it. )

IMO the quality of you system deserves better, you are on the edge, and if it where me I would be looking at stashing some cash for a Corsair VX550 (42A on +12) and catch one on sale (about $85 after rebate) or something in the same class. As CPU power requirements in general are falling over time something in that range should hold you for a long long time and more importantly easily power your system without breaking a sweat providing long term reliabity, plenty of room to upgrade or OC, and peace of mind. Keep the old one for an emergency spare, always handy to have one in the bottom of the junk closet.
 
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