My laptop shows a higher temperature in the bios than in Windows as well. I don't think it is a problem reading the sensor.
What I think it is, is in DOS or the BIOS the CPU is running flat chat. Once Windows is booted, windows tells it to slow down while it is not being used. I know this is the case with my laptop because it is a centrino and the speed goes up and down when needed.
Maybe the same thing is happening in your desktop?
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