I have an Intel Core 2 Quad CPU in an EVGA motherboard that is reporting negative CPU temperatures, like -22 C shortly before failing. These temperatures are reported instants after the CPU was reporting temps of 98 C. Is this a CPU fault, motherboard fault, or something else.

The CPU Temperatures were measured by SpeedFan.

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I'll take integer overflow for $200, Alex. – Breakthrough Dec 14 '11 at 17:39
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98C is at the thermal limit of your CPU - it is clearly overheating. The negative value likely shows that the thermal sensor likely failed at such a high temperature.

FYI - normal operating temps should be anywhere between 30 C and 60 C (many consider 60 C to be hot). Your computer has a serious problem - you should check your CPU heatsink / fan to make sure they are attached and operating correctly.

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