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3 pin IDC male connector layout
3 pin IDC male connector
at the motherboard, 3 pin male 2/54 pitch simillar to IDC

Pin

 Name
1 GND (Black)
2 +12V (Red)
3 Sense (White): spin sensor
 
Fans with three pin connectors Must Be Used on 3 pin CPU-Fan pinouts.  
The #3 pin senses fan RPM (revolutions per minute).
When no revolutions are sensed by the system, an audio alarm &/or no system boot will occur, warning the user &/or preventing proccessor overheating and burnout.
Other 3 pin fan connectors, such as case fan connectors may use a fan with a 2 pin plug (12v+ & Gnd ). RPM notification is not important on those connectors.
No alarm or boot prevention is associated with these.
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