Asus P5B SE - Manual (Page 30)

2-10 Chapter 2: Hardware information
3. Connect the CPU fan cable to the connector on the motherboard labeled
CPU_FAN.
2. Push down two fasteners at a time in
a diagonal sequence to secure the
heatsink and fan assembly in place.
A
A B
B
Do not forget to connect the CPU fan connector! Hardware monitoring errors
can occur if you fail to plug this connector.
A
B
A
A
B
P5B SE
®
P5B SE CPU fan connector
CPU_FAN
GND
CPU FAN PWR
CPU FAN IN
CPU FAN PWM