Asus Z9PE-D8 WS Manual page 54

3. USB connectors (USB3_34)
This connector is for USB 3.0 ports. Connect the USB module cable to connector
USB3_34.
4. CPU, front and rear fan connectors
(4-pin CPU_FAN1-2, FRNT_FAN1–4, REAR_FAN1-2)
The fan connectors support cooling fans. 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.
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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!
All fans feature the ASUS Fan Speed Control technology.
Chapter 2: Hardware information