Fan Dc Vs Pwm Mode

Pwm fans and or pumps are found in some cpu coolers and gpu aka graphics card coolers.

Fan dc vs pwm mode. With low frequency pwm the fan only produces a tachometric output when running and as a result cannot produce continuous feedback about the motor speed. I can toggle between dc and pwm mode in the bios. In my opinion i would say all cpu cooler fans are pwm controlled. Three wire motors can work with either dc voltage control or low frequency pulse width modulation.

I know that the fans i have are dc because they only have 3 pins but my motherboard can support 4 pin fans. Off in order to achieve a slower fan speed. In short pwm operates like a switch which constantly cycles on and off thereby regulating the amount of power the fan or pump motor gains. For anyone who installed a pwm fan this is how to enable the pwm.

Some of you probably already know the principle on which pulse width modulation pwm works but nevertheless we will explain how it actually controls the speed of a fan or a pump. Pwm stands for pulse width modulation. That s usually how pwm works but 4 wire pwm fans are slightly different. However the use of low frequency pwm switches the fan on and off and can produce noise.

Our last type of header is a four pin dc mode fan. Some cpu fans can be quite loud and annoying when running at 100 but when using pwm the fan is running quieter unless the cpu gets very hot thus cutting down on noise and. The pwm system that is. My fans are on full blast as long as my pc is on.

For anyone who installed a pwm fan this is how to enable the pwm. A hybrid pwm dc header is the best of both worlds since it can be configured for each type of fan there are even autosensing hybrid headers. The main reason is to cut down on noise from the fan when the cpu is not very hot and to save electricity.