Motherboard connectors pinouts  > Apple pinouts
Some Apple Mac Pros use a single 8 pin connector for two fans. Apple uses various color schemes for wires. This dual fan connector usually has all black wires.

 

Pin
Number
Pin
Name
Description
1      No connect
2   Fan Speed Control 

  Two wires connect to this pin, one for each fan.

  0-5 volts analog fan speed control.

  0 volts=off, 5 volts = 100%, 2.5 volts = 50%, ...

  Can also be controlled using a 5 volt PWM signal.

3      No connect
4   GND   Shared ground.  Two wires connect to this pin, one for each fan. 
5   SIGNAL1   Fan 1 RPM signal
6   SIGNAL2   Fan 2 RPM signal
7   +12v (1)   Fan 1 +12 volts
8   +12v (2)   Fan 2 +12 volts

 

8 pin IDC male connector layout
8 pin IDC male connector
at the motherboard
8 pin IDC female connector layout
8 pin IDC female connector
at the fan cable connector
According to 1 reports in our database (1 positive and 0 negative) this pinout should be correct.

Is this pinout
Apple Mac Pro dual fan connector visual pinout:
Apple Mac Pro dual fan connector diagram
click to enlarge
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