CPU getting suspiciously hot

January 17, 2011 at 19:22:23
Specs: Windows Vista
I am helping my dad with his pc and have just discovered that the cpu gets really hot when under load.
The pc is a HP Pavilion a6330.sc Desktop PC and cpu is an AMD Athlon 64 X2 5000+ (Brisbane G2). The cpu fan/heatsink is stock and the label on the fan reads "AVC F7311NC".
In Prime95 stress test the cpu temps get up to nearly 70c° within 15 minutes, before i stop the test for precaution. I read that the max temp for this cpu model is 55-68c°.
These temps are reported the same by HWMonitor and Core Temp. Idle temps are about 30c° for core #0 and 22c° for core #1.
The really weird thing is, that the cpu fan speed does not adjust when temperature increases.
The speed is fixed at about 1800rpm no matter what the cpu load or temp is at. These fan RPMs are reported by HWMonitor and seems correct, as i cannot hear or see the fan increase in speed. I have tried to connect the cpu fan to sys power connecter, but the speed stays at about 1800rpm.
This just makes no sense to me, as i would think the cpu fan is supposed to be temperature adjusted by the motherboard, and not running at a fixed speed that results in the cpu overheating. Any input is appreciated.

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January 18, 2011 at 05:13:17
30C at idle is very good. 70C under load may be a bit on the high side, but how often do you think you'll be running at 100% for an extended period? Also, all modern CPUs have built-in thermal protection circuitry. You cannot overheat one to death. The CPU will auto-shutdown long before it frys. As for the fan speed, make sure Cool'n'Quiet is enabled in the BIOS.


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January 18, 2011 at 17:00:26
I have read in many places that the temperature should not exceed 60c°, and i am therefore worried that the cpu could be damaged in the long term or i won't perform optimally.
There is no options in bios to change the fan speed or cool'n'quiet, the bios is a custom HP and only boot order and such can be changed.
Can it really be right that the fan should run at a fixed speed of 1800rpm?

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