Computer Hardware User Manual

ASUS Crosshair II Formula
2-33
7. CPU, chassis, and optional fan connectors
(4-pin CPU_FAN, 3-pin CHA_FAN1–3, 3-pin PWR_FAN,
3-pin OPT_FAN1–3)
The fan connectors support cooling fans of 350 mA–1000 mA (24 W max.) or
a total of 1 A–3.48 A (41.76 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.


not jumpers! DO NOT place jumper caps on the fan connectors!
• Only the CPU_FAN, CHA_FAN1–3, and OPT_FAN1–3 connectors support
the ASUS Q-Fan Plus feature.
• If you install multiple VGA cards, we recommend that you plug the chassis
fan cable to the motherboard connector labled OPT_FAN1/2 for better
thermal environment.
CROSSHAIR II FORMULA
®
RESET
PWR_FAN
Rotation
+12V
GND
CHA_FAN1
Rotation
+12V
GND
CHA_FAN2
Rotation
+12V
GND
CHA_FAN3
Rotation
+12V
GND
CPU_FAN
CPU FAN PWM
CPU FAN IN
CPU FAN PWR
GND
OPT_FAN1
Rotation
+12V
GND
OPT_FAN2
Rotation
+12V
GND
OPT_FAN3
Rotation
+12V
GND
CROSSHAIR II FORMULA FAN connectors
PWR_FAN
CPU_FAN
CPU_FAN
CPU FAN PWM
CPU FAN IN
CPU FAN PWR
GND
CPU_FAN
OPT_FAN3
OPT_FAN1
OPT_FAN2
CHA_FAN1
CHA_FAN2
CHA_FAN3