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I have a Vaio that had a loud fan speed problem. I found a post online that said to go to the Windows advanced power settings and set the CPU power to 99% to make it slow down. It actually worked. Something about not letting the Intel Duo core chip go into turbo mode, which keeps it cooler.

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Yep that prevents turbo which stops it from shutting down. Crippling the CPU is a pretty annoying fix, though.

Switching to the onboard Intel GPU works as well, but that means foregoing hardware decoding which means a bunch of things run like glue. I actually ended up just replacing the fan which solved the issue for at least another year until I can get a new copmuter.

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