Asus WS C422 DC Manual page 28

8. Fan connectors (4-pin CPU_FAN1; 4-pin FRNT_FAN1; 4-pin REAR_FAN1; 5-pin
EXT_FAN)
Connect the fan cables to the fan connectors on the motherboard, ensuring that the
black wire of each cable matches the ground pin of the connector.
The EXT_FAN connector is only for the fan extension card. For more details on the
fan extension card, please refer to the To install Fan Extension Card section in this
guide.
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The CPU_FAN1 connector supports the CPU fan of maximum 1A (12 W) fan power.
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DO NOT forget to connect the fan cables to the fan connectors. Insufficient air flow
inside the system may damage the motherboard components. These are not jumpers!
Do not place jumper caps on the fan connectors!
Ensure that the CPU fan cable is securely installed to the CPU fan connector.
Chapter 1: Product Introduction