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4 pin motherboard fan  connector layout
4 pin motherboard fan  connector

 

Pin
Number
Pin
Name
Description Wire color
(usual)
1 +12v Fan Power  Green mark
2 Signal   White mark
3 GND Ground non marked
4 PWM +5v (on/off control)
The Rpm Fan control can do with a normal fan bus.
While it can be driven by a 5 volt digital PWM signal, it is, in fact, an analog fan speed control signal.  0 volts = off, 5 volts = 100%, 2.5 volts = 50%, ... 
inside delta fan (behind label), red mark 

 

4 pin fan cable connector layout
4 pin fan cable connector
According to 4 reports in our database (3 positive and 0 negative) the Apple Motherboard 4 pin CPU PWM fan connector pinout should be correct.

Is this pinout
Apple Motherboard 4 pin CPU PWM fan connector visual pinout:click to enlarge
Source(s) of this and additional information: http://www.intel.com/support/motherboards/desktop/sb/cs-012074.htm
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