Asus Motherboard A8N-SLI SE User Manual page 34

3. When the fan and heatsink assembly is in place, connect the CPU fan
cable to the connector on the motherboard labeled CPU_FAN.
A8N-SLI SE CPU Fan Connector
Do not forget to connect the CPU fan connector! Hardware monitoring
errors can occur if you fail to plug this connector.
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A8N-SLI SE
®
CPU_FAN
Chapter 2: Hardware information