Pc Fan 3 Pin Connector Pinout

Fan has a 3 pin power connector.

Pc fan 3 pin connector pinout.

Three wire and four wire fan connectors. There is no fan control. A 4 pin pwm fan connector will have four square holes on the front and four wires entering the back. The 3 pin senses fan rpm revolutions per minute.

I am building my new pc asus p5b plus motherboard thermalright ultra 120 extreme heatsink and a yate loon fan to cool this heatsink. Some fans may have a 4 pin connector but only 3 wires going into the back of the connector. Fans with three pin connectors must be used on 3 pin cpu fan pinouts. Fan has a 3 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. The 24 pin connector is polarized so it can only be plugged in pointing in the correct direction. There is no fan control. The older 20 pin main power cable only has one 12 volt line.

Desktop board has a 4 pin fan header. Desktop board has a 4 pin fan header. The case fan has a 3 hole connector and all system fan connectors on the mb are 4 pin. Proper fan connector placement is shown in the figures below.

My mobo has a 4 pin header but my yate loon fan has the 4 pin molex power and a 3 pin connector. Identifying fan type 3 pin or 4 pin pwm. This is still considered a 3 pin fan. The extra pins made the auxiliary power cable unnecessary so most atx12v 2 x power supplies don t have them.

Desktop boards 3 pin and 4 pin fan connectors. 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. Desktop board has a 3 pin fan header. When using a 3 pin power connector with a 4 pin fan header the fan will always be on.

Fan has a 4 pin power connector. The new 24 pin connector added one line apiece for ground 3 3 5 and 12 volts. When using a 3 pin power connector with a 4 pin fan header the fan will always be on. It s been years since i last built a rig so i have a question on connecting the heatsink fan.

Some models have the wiring of the white wire speed sensor in the middle whereas the standard 3 pin molex connector requires the white wire as pin 3 thus compatibility issues may exist.