This is called “pulse width modulation” (PWM) and works by controlling the amount of current given to the fan at any given time. 4-pin fan controllers have a fourth connector pin that lets them modify fan speed on a software level.3-pin connectors can have their RPM modulated by adjusting the voltage sent to the fan, although this method isn’t as precise as 4-pin controllers. 3-pin headers contain 2 connectors for current and grounding and a third connector that relays information to the user about the RPM of the fans for monitoring purposes.Most computer fans come in a 3-pin or 4-pin design, each number referring to the number of connector pins. The fan header refers to the port on your motherboard that you can hook fans up to. Before buying a fan controller for your PC, take into consideration the following features.

Fan controllers let you slow fans down or turn them off when not needed which cuts down on that incessant whirring noise PC enthusiasts are familiar with.Ī good fan controller can really help your gaming experience by taking heat stress off your CPU and letting it run more efficiently.

Noise: One drawback of computer fans is that they can be pretty loud, especially if you are running an app that is demanding.

This can also increase the lifespan of the fan. You can also get controllers that automatically sense and respond to the temperature of components.

Efficiency: By the same token, a good fan controller helps make your rig more energy efficient by letting you control how much current is being supplied to your fans.

As a result, most of the time your fans are running more than they need to be.

Flexibility: Normally, computer fans are not particularly calibrated to respond to the computer’s internal state.

Computer fan control