![]() Want to read more answers from other tech-savvy Stack Exchange users? Check out the full discussion thread here. Have something to add to the explanation? Sound off in the comments. Source: Three Wire and Four Wire Fan Connectors Note: When connecting a three wire fan to a four pin fan header, the fan is always on there is no fan control.Ī four wire fan connecting to a four pin fan header:Ī four wire fan connecting to a three pin fan header: The four wire connectors are for processor fans with higher power consumption.Ī three wire fan connecting to a four pin fan header: The three wire connectors are for small chassis fans with lower power consumption. Pulse Width Modulation PWM stands for pulse width modulation, a technique that changes the duty cycleof a periodic digital pulse. To understand the reason for its existence, it’ll be best to revisit what PWM is all about. ![]() With this type, fan speed is typically controlled by increasing or decreasing the voltage over the power wire.Ī four pin connector is a little different than the three pin connector since it has the extra (fourth) wire used for controlling and sending signals to the fan, which likely has a chip on it that tells it to slow down or speed up (in addition to the other wires the three pin connector has).Ĭhassis and processor fans use either a three wire or four wire connector. A 4-pin PWM header connects to a PC fan’s connector. The NA-FC1 is a compact, highly flexible controller for 4-pin PWM fans that can both work on its own for manual speed reduction and also work in tandem with. The signal wire measures how fast the fan is moving without any controls for the fan’s speed. The first two pins are always used to deliver power to the fan. ![]() SuperUser contributor Homey_D_Clown_IT has the answer for us:Ī three pin connector is basically power (5/12 volt), ground, and signal. The common cooling fans used in computers use standardized connectors with two to four pins. ![]()
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