Pwm 4 pin: 50 фото

Pulse width modulation (PWM) fans are DC fans with an extra wire for PWM. PWM fans are 4-pin fans where the fourth wire sends a PWM signal to the fan motor. The PWM signal is the control input of the PWM fan.

Please note that 4-pin fans can also be connected to your motherboard's 3-pin fan headers, though. When connected to 3-pin fan headers, the fan will run at full speed (unless the motherboard supports voltage based speed control).

If you want to use the PWM function then the 4 Pin fan must be connected to a 4 Pin header on the motherboard. If you connect the 4 Pin fan connector to a 3 Pin header, then the fan will run at maximum RPM.

If you are building a PC that has a regular workload, constant speed DC fans provide sufficient cooling performance as well as a relatively long life. For those seeking as much control over the PC as possible, PWM is generally the way to go.

It is also possible to install a 4-pin fan on a 3-pin connector. Here the fan runs at full speed, too, provided the type of control has not been modified. Only one PWM signal for all fans can be set with the Case Fan Hub. Voltage Control via the Case Fan Hub is not possible because of the SATA power source!