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1 GND (Black)
2 +12V (Red)
3 Sense (Yellow): 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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3 pin IDC male connector layout
3 pin IDC male connector
at the motherboard, 3 pin male 2/54 pitch simillar to IDC
3 pin motherboard fan  connector layout
3 pin motherboard fan  connector
at the cable
Source(s) of this and additional information: ASUS Motherboard Manual Rob Gill
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