Asus P5B - Manual (Page 53)

ASUS P5B 2-29
8. CPU, chassis, and power fan connectors
(4-pin CPU_FAN, 3-pin CHA_FAN1, 3-pin CHA_FAN2, 3-pin PWR_FAN)
The fan connectors support cooling fans of 50 mA ~ 2000 mA (2 W max.)
or a total of A ~ 7 A (8 W max.) at +2V. 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!
Only the CPU-FAN and CHA-FAN -2 connectors support the ASUS Q-FAN 2
feature.
R
P5B
P5B Fan Connectors
CHA_FAN
CHA_FAN2
GND
Rotation
+2V
GND
Rotation
+2V
GND Rotatio
n
+2
V
PWR_FAN
CPU_FAN
GND CPU F
AN PWR
CPU F
AN IN
CPU F
AN PWM
9. Serial port connector (10-1 pin COM1)
This connector is for a serial (COM) port. Connect the serial port module
cable to this connector, then install the module to a slot opening at the back
of the system chassis.
R
P5B
P5B COM Port Connector
PIN
COM