Pc Fan 3 Pin Connector Pinout

Am putting together a pc and have run into a problem with the mb case.

Pc fan 3 pin connector pinout.

Fan has a 3 pin power connector. The new 24 pin connector added one line apiece for ground 3 3 5 and 12 volts. Three wire and four wire fan connectors. Fans and on board fan headers are backwards compatible.

Fan has a 3 pin power connector. 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. Fans with three pin connectors must be used on 3 pin cpu fan pinouts. 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. The older 20 pin main power cable only has one 12 volt line. Proper fan connector placement is shown in the figures below. The size and spacing of the pin sockets is identical to a standard three pin female ic connector and three pin molex connector.

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. There is no fan control. It s been years since i last built a rig so i have a question on connecting the heatsink fan. Fan has a 4 pin power connector.

Some fans may have a 4 pin connector but only 3 wires going into the back of the connector. When using a 3 pin power connector with a 4 pin fan header the fan will always be on. Identifying fan type 3 pin or 4 pin pwm. The 24 pin connector is polarized so it can only be plugged in pointing in the correct direction.

The case fan has a 3 hole connector and all system fan connectors on the mb are 4 pin. 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. I am building my new pc asus p5b plus motherboard thermalright ultra 120 extreme heatsink and a yate loon fan to cool this heatsink. My mobo has a 4 pin header but my yate loon fan has the 4 pin molex power and a 3 pin connector.

The 3 pin senses fan rpm revolutions per minute. Desktop boards 3 pin and 4 pin fan connectors. This is still considered a 3 pin fan. 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.