Pc Fan 3 Pin Connector Pinout

The new 24 pin connector added one line apiece for ground 3 3 5 and 12 volts.

Pc fan 3 pin connector pinout.

Proper fan connector placement is shown in the figures below. The extra pins made the auxiliary power cable unnecessary so most atx12v 2 x power supplies don t have them. It s been years since i last built a rig so i have a question on connecting the heatsink fan. Desktop board has a 4 pin fan header.

The 24 pin connector is polarized so it can only be plugged in pointing in the correct direction. Fans and on board fan headers are backwards compatible. The 3 pin senses fan rpm revolutions per minute. This is still considered a 3 pin fan.

When using a 3 pin power connector with a 4 pin fan header the fan will always be on. When using a 3 pin power connector with a 4 pin fan header the fan will always be on. There is no fan control. Three wire and four wire fan connectors.

Desktop board has a 4 pin fan header. There is no fan control. My mobo has a 4 pin header but my yate loon fan has the 4 pin molex power and a 3 pin connector. A 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.

Am putting together a pc and have run into a problem with the mb case. Fan has a 3 pin power connector. A 4 pin pwm fan connector will have four square holes on the front and four wires entering the back. Fan has a 4 pin power connector.

The size and spacing of the pin sockets is identical to a standard three pin female ic connector and three pin molex connector. Fans with three pin connectors must be used on 3 pin cpu fan pinouts. Fan has a 3 pin power connector. Identifying fan type 3 pin or 4 pin pwm.

I am building my new pc asus p5b plus motherboard thermalright ultra 120 extreme heatsink and a yate loon fan to cool this heatsink. Desktop boards 3 pin and 4 pin fan connectors. When no revolutions are sensed by the system an audio alarm or no system boot will occur warning the user or preventing proccessor overheating and burnout. The case fan has a 3 hole connector and all system fan connectors on the mb are 4 pin.

The older 20 pin main power cable only has one 12 volt line.