Asus MOTHERBOARD K8N-E - Manual (Page 32)

2-10 Chapter 2: Hardware information
2.3.4 Connecting the CPU fan cable
When the heatsink and fan assembly is in place, connect the CPU fan
cable to the connector on the motherboard labeled CPU_FAN.
CPU heatsink and fan Qualified Vendors List
The following table lists the CPU heatsink and fan assembly that have
been tested and qualified for use with this motherboard.
Vendor Part Number
AVC Z7UB003
Thermaltake AP1892
Taisol 111-8061010-90
CPU Fan Connector
(CPU_FAN)
Do not forget to connect the CPU fan connector! CPU overheating and
hardware monitoring errors may occur if you fail to plug this connector.