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ASUS Crosshair 2-31
6. CPU, chassis, and optional fan connectors
(4-pin CPU_FAN, 3-pin CHA_REAR_FAN, 3-pin CHA_FRONT_FAN, 3-pin
OPT_FAN1, 3-pin OPT_FAN2, 3-pin OPT_FAN3, 3-pin OPT_FAN4, 3-pin
OPT_FAN5)
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. Insufcient air
ow inside the system may damage the motherboard components. These are
not jumpers! Do not place jumper caps on the fan connectors!
CROSSHAIR
CPU_FAN
GND
+12V
Rotation
OPT_FAN1
GND
+12V
Rotation
OPT_FAN2
GND
+12V
Rotation
OPT_FAN5
GND
+12V
Rotation
OPT_FAN4
GND
+12V
Rotation
CHA_FRONT_FAN
GND
+12V
Rotation
OPT_FAN3
GND
+12V
Rotation
CHA_REAR_FAN
OPT_FAN1
CHA__REAR_FAN
CHA__FRONT_FAN
OPT_FAN3
OPT_FAN4
CPU_FAN
OPT_FAN2
OPT_FAN5
CROSSHAIR Fan connectors
GND
+12V
Rotation
RPM adjustment
7. Chassis intrusion connector (4-1 pin CHASSIS)
This connector is for a chassis-mounted intrusion detection sensor or switch.
Connect one end of the chassis intrusion sensor or switch cable to this
connector. The chassis intrusion sensor or switch sends a high-level signal to
this connector when a chassis component is removed or replaced. The signal
is then generated as a chassis intrusion event.
By default, the pins labeled “Chassis Signal” and “Ground” are shorted with
a jumper cap. Remove the jumper caps only when you intend to use the
chassis intrusion detection feature.
CROSSHAIR
GND
(Default)
Chassis Signal
+5VSB_MB
CHASSIS
CROSSHAIR Chassis intrusion connector