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CPU fan on high.. all the time

Last response: in Overclocking
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March 29, 2010 7:16:51 PM

I have a Zalman CNPS7000 on a c2d e6600, on an Asus P5NSLI.

It runs at full all the time. very good temps, < 30c, but it's LOUD.

I have the latest bios(18.01). I've added a FanMate to slow it down.

But I'm wondering why it was running full out in the first place.

Any ideas?

More about : cpu fan high time

a b K Overclocking
March 29, 2010 7:22:24 PM

Did you check your settings in your BIOS? With AMDs, they have an option called Cool n' Quiet. If you turn this off for those chipsets, it will run the CPU at full strength the entire time which means your CPU may run at the hottest temperature the entire time. Cool n' Quiet will throttle the speed of the CPU based on the activity that is going on with it. I think with Intel they have something like that called SpeedStep which does the same thing.

Have you also monitored your ambient temperatures in your case? Maybe you don't have good air flow through the case so the internal temperature in the case is running high and causing the CPU fan to run faster?
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March 29, 2010 7:36:25 PM

I have the Asus Q Fan enabled in the BIOS. There are no settings to modify (Target tempurature, or fan speeds), just on/off.

The temps in the HDD's and the graphics card sensors are good - 42c on the GPU, (GT8600), the ambieant temps reads low 30's.

I have 2 80mm intakes in front, and 180mm exhaust in the rear. plus the PSU exhaust(120mm).






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March 29, 2010 7:53:00 PM

Did you try switching it to PWM fan control instead of DC? And doesn't this fan come with a fan controller attachment?
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March 30, 2010 12:03:19 AM

Sounds to me as though the CPU Smart Fan option in the BIOS is disabled. When disabled, it runs the CPU fan at maximum RPM constantly. With it enabled, it will throttle the fan speed as needed when it heats up. For 3-pin fans such as this, use the Voltage option, not PWM. I'm not familiar with ASUS Q Fan... Perhaps ASUS renamed Smart Fan to "Q Fan"?

You'll want to be sure the fan is plugged into the proper lead on the motherboard. The correct lead should be a 4-pin one labeled CPU-FAN located near the very top of the board by the first memory slot.
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