Asus P5B-MX - Motherboard - Micro ATX User Manual page 46

7. CPU and chassis fan connectors
(4-pin CPU_FAN, 3-pin CHA_FAN)
The fan connectors support cooling fans of 350 mA ~ 2000 mA (24 W max.)
or a total of 1 A ~ 7 A (84 W max.) at +12V. Connect the fan cables to the
fan connectors on the motherboard, making sure that the black wire of each
cable matches the ground pin of the connector.
Do not forget to connect the fan cables to the fan connectors. Insufficient air
flow inside the system may damage the motherboard components. These are
not jumpers! Do not place jumper caps on the fan connectors!
P5B-MX/WiFi-AP Fan Connectors
Only the CPU-FAN and CHA-FAN connectors support the ASUS
Advanced Q-Fan feature.
1-34
CPU_FAN
CPU FAN PWM
CPU FAN IN
CPU FAN PWR
GND
CHA_FAN
Rotation
+12V
GND
Chapter 1: Product introduction