How to Lower the CPU Fan Speed
The CPU, or central processing unit, takes care of the calculations and computations of a computer system. If your CPU has higher clock speeds, you should enjoy a smoother experience with lower loading times. Because the CPU works constantly as you use the computer, it needs a fan to prevent it from overheating. Normal CPU fans work at around 4,500 rpm to keep the CPU in a working temperature and stabilize the system. If you notice that your computer is too noisy, the fan speed is possibly set to a higher value. You can lower the CPU fan speed to normal levels using the BIOS or other software applications.
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Instructions
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Enter your system BIOS by pressing the "F2" or "Del" keys on your keyboard before the computer runs the operating system. The layout of the BIOS varies, so explore the different options and see if it features a way to monitor and lower the CPU fan speed.
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Download SpeedFan if your BIOS does not support CPU fan speed changing. In addition to the ability to lower the fan speed, SpeedFan detects any hardware monitor chips in your system to report accurate readings of the CPU, hard disk and GPU temperatures. This freeware application also lets you see the speeds of other fans in your system.
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Download ASUS PC Probe II if you have an ASUS motherboard in your system. ASUS PC Probe II works similarly to SpeedFan, as it lets you lower the CPU fan speed and monitor the temperatures of different components. One unique feature is that it runs in the background constantly checking if the system is regulating the fan speeds and temperatures. If the temperature or voltage reaches a certain threshold, ASUS PC Probe II yields an audio warning so you can take the necessary actions to cool your CPU or minimize usage.
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Tips & Warnings
When browsing through the BIOS, look for the power, hardware or temperature sections, which are the common areas where the CPU fan speed is located.
Do not set your CPU fan speed to a value less than 4,000 rpm. Your CPU may get hotter as a result and cause sudden system crashes or restarts if the CPU gets hot enough.
