Problem controlling the fan speed in BIOS

Asked By Thomas S Rowe 40 points N/A Posted on - 09/25/2014

Hello. Today I noticed that my fan speed was working at a much slower speed than normal. At first I could not hear it as loudly as usual, and then I checked the temperature readings, and the fan was actually running at half speed, and my CPU temperature was rising. I tried to change the fan speed in the BIOS, but it looked like I wasn’t allowed. I don’t understand why this is so, when I usually take the same steps and BIOS allows me to change with no hitch. Could there be a deeper problem than a faulty fan?

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Best Answer by ferdinand Magellan

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Answered By ferdinand Magellan 0 points N/A #182040

Problem controlling the fan speed in BIOS

Hi Thomas, normally in the BIOS, you may see an option called Hardware monitor. Check the icon for CPU fan, and sometimes this is set on default. If not, by using the number pad positive [+] or negative [-] you could set the temperature of let’s say 40 degrees. Once this is set up the CPU fan speed will become visible and you can now set it to whatever speed you seem appropriate for the speed. You can also set it up between two methods via voltage or PWM mode. I prefer PWM since this sends precise voltage pulse to the fan, so to minimize the noise level.  Then before leaving the option just Save it then Exit back to your main BIOS menu. 

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• Posted on - 10/16/2014
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Answered By Sharath Reddy 590495 points N/A #182041

Problem controlling the fan speed in BIOS

If you let your BIOS control the fan speed according to the current temperature reading then there is probably something wrong with the cooling fan not able to spin much faster though the temperature is already rising. Try replacing the cooling fan or maybe use a spare fan from a different CPU to check if the fan will spin faster than the original.

If the second fan spins a lot faster than the other one then you really need to replace it with a new one. You can also try setting the fan to the maximum speed in the BIOS regardless of the current temperature reading in the CPU. This way, you can be assured that the temperature will be maintained.

The only problem if you keep this setting is that, in the long run the fan will become noisy as a result of wear and tear since it is spinning at the maximum speed.

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• Posted on - 10/22/2014
• Question Category: Hardware