What is the PWM cable for?

PWM stands for “Pulse Width Modulation”, this allows the motherboard bios to control your fan speeds based upon temperature variations. The PWM connector at the end of the fan cable is plugged onto the PWM headers located directly to the motherboard.

Where does the PWM cable go?

Where do PWM cables go? The PWM cable goes directly into the Motherboard. Most of the users cannot install PWM cables just because they are putting them in the wrong Header. PWM cable comes with a 4-pin header, where most of the case fans are basically installed on three-pin headers.

Where do I connect PWM connector?

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.

Is PWM good?

A side-effect of the greater speed control that PWM fans provide is that while the computer doesn’t need the extra cooling, it will spin far slower and produce far less noise than DC fans. Since DC fans typically run faster than PWM fans while idling, they are louder.

What is PWM and how it works?

Pulse Width Modulation (PWM) is a technique which takes a constant steady state DC voltage and produces a train of fixed amplitude ON/OFF pulses whose average DC value is determined by the width or duration of the pulses given by the duty cycle. The current is determined by the impedance of the load being supplied.

How long can a PWM cable be?

The base price is for an 12″ cable and there are options to add 6″ lengths up to 36″ total extension. For any hardware using a 4-Pin PWM power connector like some Intel CPU coolers for Socket 775.

Is PWM necessary?

Non-PWM fans can still have their speed adjusted by the mobo or a dedicated fan controller. PWM fans are more power efficient (although I can’t imagine them saving you more than a few watts). I think a given PWM may have a lower minimum speed than an ‘equivalent’ non-PWM fan, but non-PWM fans can still run slow enough.

Why do we need PWM?

PWM is used in many applications, ranging from communications to power control and conversion. For example, the PWM is commonly used to control the speed of electric motors, the brightness of lights, in ultrasonic cleaning applications, and many more.

What is PWM and where is it used?

Pulse Width Modulation (PWM) is a fancy term for describing a type of digital signal. Pulse width modulation is used in a variety of applications including sophisticated control circuitry. A common way we use them here at SparkFun is to control dimming of RGB LEDs or to control the direction of a servo.