Your gpu usage can go up and down like that due to a faulty PSU also. I see a ton of problems mis-diagnosed as something else when its actually a problem with a psu. Psu testers are so cheap that every "enthusiast" should own one. It gives you piece of mind knowing that its good because you have tested it. Newegg sells a great one for just over $20 if I can recall correctly. Might try that just to be sure.
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Originally Posted by zodac
zodac fixed the spreadsheet, but says she doesn't wanna join your unofficial club.