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5. CPU, Chassis, and Power Fan Connectors
(3-pin CPU_FAN, CHA_FAN, PWR_FAN)
The three fan connectors support cooling fans of 350mA (4.2 Watts) or
a total of 1A (12W) at +12V. Orient the fans so that the heat sink fins
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!
P4B 12-Volt Fan Connectors
Figure 2-35
CPU, Chassis, and Power Fan Connectors
6. USB Header (10-1 pin USB2)
If the USB port connectors on the rear panel are inadequate, a USB
header is available for two additional USB port connectors. Connect a
2-port USB connector set to the USB header and mount the USB
bracket to an open slot in the chassis.
P4B USB Header
Figure 2-36
USB Header
ASUS P4B motherboard user guide
PWR_FAN
®
P4B
CPU_FAN
CHA_FAN
10
®
P4B
5
1: USB Power
2: USBP2–
3: USBP2+
4: GND
5: NC
USB2
6
1
6: USB Power
7: USBP3–
8: USBP3+
9: GND
2-27
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