PWM fans are 4-pin fans, where the fourth wire sends a PWM signal to the fan motor. PWM fans are DC fans with an extra wire for PWM. These fans are also called 3-pin fans, as they come with 3 pins: a supply pin (usually 12 V DC), a ground pin, and a signal pin. Cooling fans are a vital part of computer hardware, as they cool the CPU and ventilate casing.ĭC fans are supplied with DC power from regulated DC supply or motherboard header pins.
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