Motherboard connectors


3 GND (Black)
2 +12V (Red)
1 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. Typically, the motherboard is required to pull the pin up through a resistor, with the fan connecting it to ground once (or more) per revolution.

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.

3 pin IDC male connector layout
3 pin IDC male connector
at the motherboard
3 pin motherboard fan  connector layout
3 pin motherboard fan  connector
at the fan cable
According to 31 reports in our database (29 positive and 0 negative) this pinout should be correct.

Is this pinout
Motherboard 3 pin CPU or Case Cooling fan connector visual pinout:
Motherboard 3 pin CPU or Case Cooling fan connector diagram
click to enlarge
Source(s) of this and additional information: ASUS Motherboard Manual Rob Gill
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