Fans connected with this cable also spin at maximum RPM. Molex Fan Connector connects the fan to your PSU (Power Supply Unit).However, it uses the sense pin to control the RPM according to the CPU load. 4-pin Pulse Width Modulation (PWM) is also connected to the motherboard.Fans connected with this cable spins at maximum RPM unless we change the speed from the BIOS.

3-pin DC fan connector cable connects the fan to your motherboard.

You can find three types of cables that connect the fans to the motherboard/power supply. Depending on the cables attached, the fans on a desktop PC are connected either to the motherboard or the power supply. How Does a Computer Change the Fan Speed?įirst, let’s discuss how a computer controls its fan speed. However, you can control your fan speeds according to your needs using third-party applications or tweaking fan settings on your BIOS. If you are doing some CPU-intensive tasks, your CPU cooler will spin at a higher RPM (Rotations Per Minutes).

A computer adjusts its fan speed according to the load it gets.

Change fan speed laptop