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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
up vote 12 down vote accepted

98C is at the thermal limit of your CPU - it is clearly overheating. The negative value likely shows that the thermal sensor 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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I often see negative figures with speedfan as well and I'm not convinced this is a hardware problem, more likely a software problem. I am using the hardware monitor from now ( and don't see those negatives anymore.

That being said, you do have a serious cooling problem and at those temperatures, you risk damaging your hardware. If a standard fan doesn't provide the necessary cooling in your environment, you may want to consider liquid cooling. These days, there are decent models at the price of a high-rated fan (e.g. Corsair Liquid Coolers). I have bought an entry level for my i7 and under medium load (while gaming), my cpu doesn't go over 40C. Constant load under prime95 is about the only thing that can push it towards the 60C.

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yep Im seeing negatives here but ok numbers on my official Asus AI application – HaveAGuess Nov 28 '14 at 19:23

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