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Originally Posted by graffen
This is the original poster just following up on the resolution of the original problem. That problem was the discovery that I could not o/c my 7900GT by even one megahertz. I suspected the PSU was the problem. Thanks especially to flanzig1 & glc for helping me. I replaced the Dell 350W PSU with a 520W OCZ Powerstream power supply, and the problem went away. I now have the card o/c'd to 562/810 (from 450/685) and this provides about a 5% improvement in benchmarks and game fps averages. Ironically, even at this overclocked state, temps went down by 3 degrees in all ranges of idle and stress. I guess this has to do with the card fan receiving more stable power? The only disadvantage to the 520W OCZ is that it makes my CPU fan spin at astronomically faster rates when the CPU is very stressed. This isn't too often though -- the worst is during the CPU tests of 3dMark.
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Glad to see your problem got sorted out.
The CPU fan is probably gauged so that it runs according to the stress of the CPU - this keeps it quiet when you aren't doing anythind difficult. If it didn't pick up speed when the CPU is going 100%, then the temps would rise. Again, glad to see you've got it sorted out. There weren't any problems replacing the Dell PSU?