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MacPro Fan PinOut


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iDVD

iDVD

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Hello, I'm doing a MacPro case mod project.  And I want to connect MacPro fans to motherboard or power supply, but I'm having problem connecting it. I can't find which pin goes where. Maybe someone knows how to connect it right ?

 

If I try connect first pin(GND) to ground and second pin (VCC) to +12V nothing happens.

 

If I try connect first pin(GND) to ground and second pin (VCC) to +12V  nothing happens and fourth pin (VM) to +5V 
My guess is:
GND = Ground
VCC  = +12 (but I'm not 100% sure)
O / P = Sense /Tacho (but I'm not 100% sure)
VM = PWM (but I'm not 100% sure)
 
I take some pics and mane diagram for more understanding if i helps.
 
Maybe someone know how make this thing work ?

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