![]() The human ear is unable to detect anything other than the sound of the blades moving air through the chassis. When the fan is in motion, this signal wave will quickly alternate between on and off states. This additional cable allows for input to be delivered to the PWM circuit, which allows the system to send square waves of high-frequency current (⎍⎍⎍) to determine whether the motor powers on or off. It's still possible to alter the speed of DC fans by altering the amount of power provided to the fan and many motherboards will be able to do just that - but it's still nowhere near as fine-tunable as a PWM circuit.Ī DC fan or pump has just three pins, compared to the four with a PWM component. By using this method, the fan can fine-tune its own speed. The longer and faster the pulses, the closer the fan gets to a full 12 volts. So instead of feeding your fan a steady 12 volts of power, your fan gets brief, rapid pulses every few milliseconds. ![]() Direct current fans draw power straight from the source without the ability to regulate just how much power should be turned into the movement of the blades. PWM is short for Pulse Width Modulation, an electrical term for a power supply that pulses. ![]() You have PWM, as explained already in this guide, and direct current (DC). There are two options when it comes to choosing fans for your PC build.
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