This page provides the connector style and pinout for the Fan connector used on the ATX Motherboard.
The Header attached to the mother board is normally a male 3-pin header w/ locking tab.
However the 4-pin header is also some what common
The mating connector coming from the Fan cable uses Female sockets.
Not all fans or mother boards control or power the fan assemblies the same way.
In many cases the Fan will run one wire to the three pin header shown below [Sensor pin],
and also use an additional Molex connector to provide power to the fan [Male/Female or both].
The only fan header specified in the ATX standard [that I know of] was optional, and was a 6-pin connector.
Also, fans may be either 5 volt DC or 12 volt DC fans, the table below shows a 12 volt DC fan connection
All other ATX header pinouts, or
BTX motherboard header pinout.
| Pin # | Signal Function | Cable |
| 1 | GND | Black |
| 2 | +12VDC | Yellow |
| 3 | Sensor | Yellow |
The pin out table above provides both the connector pinouts and wire colors for the cable assembly.
I have also seen 3-wire cable assemblies running from the fan that used White, Red, Back. [5 volt system]
No data on copper AWG wire size is provided here.
 PC Fan |
Additional Mother Board form factors and processor types are listed on
the OEM MotherBoard Manufacturers
page.
A few computer manufacturers may use non-standard or
proprietary components in their systems. |
Electronic Key words: Personal Computer. ATX, Fan, Board Standard, Interface Standard,
Specification, Spec,
Molex, Interface, Physical Interface, Description, Personal
Computer Interface, PC, ATX Pinout, Main Power,
Header, Pin out, Pins,
Pin Assignment, Signal Name, Header, Motherboard Pinout, Mother Board, Cooling, Sensor.
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