If you have never had a self-shutdown or reset then i don't think there's a problem, i think TheBlasphemer is corrent, some computer mark some temperature while others another one. My computer marks my CPU is always at 60C, i told this to a friend... almost kills me, he said it's a very high temperature, but anyway my computer is running fine and i checked the heatsink and i don't think it's 60C
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You can also check for yourself after using your computer for a while touch your heatsink, if it's 'untouchable' then you have a problem.
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