Hi All,

Got a couple of spare quiet fans sitting about that I'm going to fit to my PC. These are three wire jobs with the special connector.

Now, I don't have any spare power points on the mobo for these so I was going to wire them up using a molex connector. Problem is, I can't remember what wire is which.

So can someone point me to the decode of the four wires on a molex connector (thing you plug into hard drive for power) and also a decode of what the white wire on a three wire fan is for. I faintly remember something about speed control/speed sensing but I can't remember.

Basically, I'm planning on hooking the black (-) and the red (+) wire up to the molex to get some air moving around this case.

Cheers

Ian

Hi Ian

always try to help a fellow Ian

4 wire power connector
red = +5v
black = gnd
black = gnd
yellow = +12v

3 wire fan connector
red = +12v
white = for speed sensor
black = gnd

A lot of fans will not work on 5 volts as it isn't enough to power the electronics inside them, those that do will run slower and quieter

hth Ian (lippy)

Thanks Ian. Perfect, just what I needed.

Cheers

Ian