Asus P4B-LX - Manual (Page 39)

ASUS P4B-LX motherboard user guide 2-19
3. CPU and chassis fan connectors (3-pin CPU_FAN, CHASSIS_FAN)
The fan connectors support a CPU fan and a chassis fan at +12V.
Orient the fans properly to allow air flow to go across the onboard heat
sinks instead of the expansion slots. The fan wiring and plug may vary
depending on the fan manufacturer. Connect the fan cable to the
connector matching the black wire to the ground pin.
Do not forget to connect the fan cables to the fan connectors. Lack of
sufficient air flow within the system may damage the motherboard
components. These are not jumpers! DO NOT place jumper caps on
the fan connectors!
Figure 2-23 Fan Connectors
Figure 2-24 USB Header
4. USB header (10-1 pin USB23)
If the USB ports on the rear panel are inadequate, a USB header is
available for two additional USB ports. Connect a 2-port USB connector
set to the USB header and mount the USB bracket to an open slot in the
chassis.
P4B-LX
P4B-LX 12-Volt Fan Connectors
CHASIS_FAN
CPU_FAN
GND Rotation +12V
GND
Rotation
+12V
P4B-LX
P4B-LX USB Header
USB23
1 5
6 10
1: USB Power
2: USBP2–
3: USBP2+
4: GND
5: NC 6: USB Power
7: USBP3–
8: USBP3+
9: GND