5.
When the fan and heatsink assembly is in place, connect the CPU fan
cable to the connector on the motherboard labeled CPU_FAN.
M2N4-SLI
M2N4-SLI CPU Fan Connectors
Do not forget to connect the CPU fan connector! Hardware monitoring
errors can occur if you fail to plug this connector.
ASUS M2N4-SLI
R
CPU_FAN
2-9