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Why are the fans in a computer so loud?

Updated: 8/17/2019
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12y ago

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Fans move air to cool your PC by pulling the hot air out and cooler ambient room air in. Fans are typically the loudest components in a computer. They cool the main processor, called the CPU, the power supply, and cool additional components like the video card and hard drives. All these devices generate significant heat. Look for a PC with 120mm fans and you'll typically get a quiter PC that moves as much air. Those fans are larger, turn slower, and move more air. You can replace your power supply with a 120mm fanned power supply to reduce the noise as well. If you turn your fans off and don't use them, you'll get a quiet PC that wont run very long and will likely permanently damage your computer.

A fans purpose is to circulate air to remove heat from the intended target. Sound is generated when air is moved rapidly. This is the concept of hearing. The faster more forceful the air is moved, the louder the noise. To decrease the audio noise of a fan but displace the same amount of air, the larger the fan blades should be resulting in a slower fan.

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