Motherboard connectors pinouts
For 4-Wire Pulse Width Modulation (PWM) Controlled Fans
Pin
Number
Pin
Name
Description Wire color
(usual)
1 GND Ground black
2 +12V Fan Power yellow
3 SIGNAL Fan RPM green
4 PWM Digital Control blue

The PWM signal from the motherboard sources 5V during the on state of the pulse, otherwise it's pulled to ground.

The tacho signal from the fan sinks to ground for every revolution, the input on the motherboard is pulled high.

3-pin fan and 4 pin motherboard connector compatibility: 

A fan with a 3-pin power connector may be easilly fitted into desktop board with a 4-pin fan header

 

 

4 pin motherboard fan  connector layout
4 pin motherboard fan  connector
at the PC Motherboard
4 pin fan cable connector layout
4 pin fan cable connector
at the cable
According to 13 reports in our database (12 positive and 0 negative) this pinout should be correct.

Is this pinout
Motherboard 4 pin CPU PWM fan connector visual pinout:
Motherboard 4 pin CPU PWM fan connector diagram
click to enlarge
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