Asus KCMA-D8 User Manual page 34

5. When the heatsink and fan assembly is in place, connect the CPU fan cable
to the connector on the motherboard labeled CPU_FAN.
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6. Repeat steps 1 to 5 to install the other heatsink and fan assembly if you
have installed a second CPU, then connect the fan cable to the other 4-pin
connector.
2-16
Do not forget to connect the CPU fan connector! Hardware monitoring
errors can occur if you fail to plug this connector.
This connector is backward compatible with old 3-pin CPU fan.
Chapter 2: Hardware information