In normal operation, my PC heat stays at around 40C. When I am doing high-level stuff like moving my video onto the HDD, I heat up to like 60C.
The only day I actually ever received an alert for overheating (and it was in the red level), was the day I got a trojan that bypassed my securities and it somehow overheated my PC all the while trying to convince me to buy an anti-spyware software to get rid of whatever. Once the trojan was gone, the PC lost its fever.
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