Asus MOTHERBOARD L1N64-SLI WS User Manual page 33

5. When the fan and heatsink assembly is in place, connect the CPU fan cable
to the connector on the motherboard labeled CPU0_FAN.
L1N64-SLI
WS
L1N64-SLI WS CPU fan connectors
Do not forget to connect the CPU fan connector! Hardware monitoring errors
can occur if you fail to plug this connector.
6. Repeat steps 1 to 5 to install the other heatsink if you have installed a second
CPU, then connect the fan cable to the 4-pin connector labeled CPU1_FAN.
ASUS L1N64-SLI WS
CPU0_FAN
CPU0_FAN
CPU1_FAN
CPU1_FAN
2-