i7 860 / DP55KG - cpu fan control not working

webadmin@intel.com — Wed, 23 Dec 2009 16:30:02 GMT

Hi,

my problem is that cpu fan doesn't speed up even under 100% load. When controlled by MB cpu fan runs always at minimum speed ~950 rpm. I ran Prime95 about 10min and core temp rose to ~70c. There was no fan speed increase. Intel Desktop Control Center (DCC) reported that delta to Tjmax is about 30 degrees but I'm fairly sure that fan speed should increase well before ~70c. I am able to make the fan run faster by setting the fan speed manually. The fan speed increase is audible so I think figures reported by DCC are at least somewhat accurate.

Has anyone seen this kind of problem with cpu fan control? What coud be causing this? CPU? MB? Fan? Is there some possible fix that I could try?

All help is much apppreciated.

System:

MB: Intel DP55KG

CPU: i7 860 (stock speed)

CPU cooler: Nexus FLC-3000 (4pin connector, cpu fan control enabled with pwm)

PSU: Chieftec 750W

Test software:

- Desktop Control Center (fan speed and temp monitoring and manual setting)

- Prime95

Tried fixes so far:

- checked physical connections

- checked BIOS settings, cpu fan shoud be controlled by MB

- reinstall BIOS software

- reset BIOS settings by setting jumper to 2-3 position

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i7 860 / DP55KG - cpu fan control not working