What are the 4 wires on a computer fan?
A 4-wire fan has power, ground, a tach output, and a PWM-drive input. PWM, in brief, uses the relative width of pulses in a train of on-off pulses to adjust the level of power applied to the motor. A 2-wire fan is controlled by adjusting either the dc voltage or pulse width in low-frequency PWM.
What are the 3 pins on a 3 pin fan?
A three pin connector is basically power (5/12 volt), ground, and signal. The signal wire measures how fast the fan is moving without any controls for the fan’s speed. With this type, fan speed is typically controlled by increasing or decreasing the voltage over the power wire.Jun 20, 2017
What are the 4 pins on a PWM fan?
This brings us to the next question. Why is there a need for a 4-pin PWM connection when a 3-pin header will do? A 4-pin PWM fan does more than the 3-pin’s power, ground, and signal connections to the motherboard—it also has a fourth wire that provides feedback from a built-in tachometer sensor to the motherboard.
Can I plug a 3 pin fan to 4 pin?
Please Note: You can connect a 3 Pin Fan to a 3 Pin or 4 Pin header on the motherboard. The fan will function normally no matter type of fan header is used.