Asus Crosshair II Formula - Manual (Page 59)

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.
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, 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
FA
N PW
M
CPU
FA
N IN
CPU
FA
N PW
R
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
FA
N PW
M
CPU
FA
N IN
CPU
FA
N PW
R
GND
CPU_FAN
OPT_FAN3
OPT_FAN1
OPT_FAN2
CHA_FAN1
CHA_FAN2
CHA_FAN3