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There are four differences between 3-Pin and 4-Pin Fan connectors.

Now let’s see the difference between 3 pin and 4 pin fans. I hope you got clear of 3 and 4 pin fan connectors. In other words, the longer the voltage is applied to the fan motor coils, the higher the rotational speed and vice versa. It adjusts the RPM using a PWM signal and simultaneously provides tachometer feedback. The PWM wire is very important for proper CPU cooling in modern PC towers. The 4 pin fan connector is slightly different from the 3 pin connector also works the same but the additional 4th wire is PWM ( Pulse Width Modulation) used for controlling the power supply of the load and rotation speed of the fan impeller. 4 Pin FanĤ pin fan headers are commonly found in modern motherboards. In this way, the fan speed is typically controlled by increasing or decreasing the voltage across the power cable. The 3 pin fan connector has three indicators (as per the number of wires): The first wire is for power (4 to 12 volts), 2nd is for ground and 3rd wire is for a tachnometric signal (speed sensor) this sensor monitors the fan speed and performance.Ī tachnometric signal adjusts the level of power applied to the motor by transmitting the speed of rotation of the fan impeller at a nominal voltage between 5 to 12 volts.