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3 pin IDC male connector layout
3 pin IDC male connector
at the board
3 pin IDC male connector layout
3 pin IDC male connector
at the fan

 

Pin
Number		 Pin
Name		 Description
1 GND Ground
2 +12V Positive voltage. Some motherboards use temp sensors to reduce the fan voltage as a method of speed control, the Asus A8N32-SLI deluxe being an example. 
3 - Tachometer

 

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