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How to decrease the CPU Fan speed

Posted on 2010-09-24
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Last Modified: 2013-12-09
Motherboard: P5B Deluxe WiFI-AP
CPU FAN: Zalman CNPS9700 NT

Recently, I changed CPU fan to Zalman but the fan noise is too loud so I want to decrease the fan speed.

When I go to bios I only see "Hardware monitor" and I can't change the CPU fan speed. There is only 1option and that's "Ignore"

So how to decrease the cpu fan speed without costing any money.
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Question by:bt1942
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by:Robby Swartenbroekx
ID: 33752402
The tool SpeedFan can be very helpfull.
I thought it had the option to monitor the temperature of your CPU and adjusting the fan speed to this.
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Expert Comment

by:JackStoneExpert
ID: 33752962
You cannot manually control the speed of CPU fan, since the idea of hardware monitoring and control is to keep CPU temperature in acceptable range. The noise is a result of fan design and CPU load. If you force speed reduction by any means, you risk burning your CPU and mainboard.
There are ways to reduce noise, but some expenses are unavoidable.
If your mainboard is relatively new, you may have luck. Check if your mainboard has controllable fan connectors (regular, not CPU). You may have a chance to adjust speed of fans via BIOS.
In case you are not able to control speed of fans via BIOS, you may still solve noise issue by buying fan controller, which fits to DVD drive slot - about 10 USD for 6-fan controller. Proper allocation of fans within casing will significantly reduce internal casing temperature, which means also CPU.
The problem of small casings is heat accumulation and high CPU fan noise. No need to buy big tower casing, but midi tower isn't good choice.
If you do not want to invest in fan controller, you may still reduce fan speed by using resistor 80-150 Ohm. This method does not guarantee success, since many fans have non-linear operation characteristic. Generally speaking, removing heat from computer casing by means of air flow will always generate noise, whatever you do. Personally I use water cooling. Just to reduce noise, not to overclock. And I use fans, since some air flow is required - not all components are cooled by water. But the speed of those fans is dramatically reduces to about 40%. You cannot hear them.
Hoe it will give an idea about computer air cooling limitations and help to solve your noise problem.
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bt1942 earned 0 total points
ID: 33753676
Thank you for the comments.
Problem solved by installing ASUS PC ProbeII V1.04.83.
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