Asus P3-PE5 - Manual (Page 22)

2-6 Chapter 2: Basic installation
2.4.3 Installing the CPU fan and heatsink assembly
The system package includes a proprietary CPU fan and heatsink assembly
to ensure optimum thermal condition and performance.
DO NOT replace the proprietary CPU fan and heatsink with other models!
Refer to the figure below for the location of the CPU fan connector on
the motherboard.
Do not forget to connect the CPU fan connector! Hardware monitoring
errors can occur if you fail to plug this connector.
R
Fan Connectors
CPU_FAN
GND
CPU FAN PWR
CPU FAN IN
CPU FAN PWM
To install the CPU fan and heatsink
assembly:
1. Place the heatsink on top of the
installed CPU.
2. Drive four screws into the fan
holes to secure the fan to the
motherboard.
3. Connect the CPU fan cable.