PC peripheral power connector


Disk drive connector (Molex 8981)

PinColorFunction
1Yellow+12 V
2BlackGround
3BlackGround
4Red+5 V


Floppy Power (Mini-Molex)

PinColorFunction
1Red+5 V
2BlackGround
3BlackGround
4Yellow+12 V


Serial ATA Power connector

PinColorFunction
1Orange+3.3 V
2Orange+3.3 V
3Orange+3.3 V
4BlackGround
5BlackGround
6BlackGround
7Red+5 V
8Red+5 V
9Red+5 V
10BlackGround
11BlackGround/Optional
12BlackGround
13Yellow+12 V
14Yellow+12 V
15Yellow+12 V

Pins 1, 2, and 3 are optional.
Pins 3, 7, 13 and Ground are longer on the plug so they connect first.
Pin 11 can be used for activity indication, staggered spin-up, both, or nothing.


3 and 4-Pin Fan Connector

PinColorFunction
1BlackGround
2Red+12 V (or variable)
3YellowTachometric Signal

PinColorAlt. ColorFunction
1BlackBlackGround
2YellowRed+12 V
3GreenYellowSense Signal
4BlueBluePWM Control

Note: 3-pin and 4-pin versions are compatible: 4-pin can be plugged into 3-pin headers (and vice versa), but lose its fan speed control.