6.CPU, Chassis, and Power Fan Connectors (3-pin CPU_FAN, PWR_FAN, CHA_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 heatsink fins allow air flow to go across the onboard heatsink(s) 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!

CPU_FAN

PWR_FAN

P4B-E

CHA_FAN

Rotation +12V GND

GND

+12V Rotation

GND

+12V Rotation

P4B-E 12-Volt Fan Connectors

Figure 2-40 CPU, Chassis, and Power Fan Connectors

7.USB Header (10-1 pin USB23)

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.

 

USB23

P4B-E

1

5

 

6

10

 

1: USB Power

6: USB Power

 

2: USBP2–

7: USBP3–

 

3: USBP2+

8: USBP3+

 

4: GND

9: GND

 

5: NC

 

P4B-E USB Header

Figure 2-41

USB Header

2-30

Chapter 2: Hardware information