EVGA P55 FTW - Manual (Page 20)

USB Headers
This motherboard contains seven (7) USB 2.0
ports that are exposed on the rear panel of the chassis
(Figure 2). The motherboard also contains three (3) 10-
pin internal header connectors onboard that can be used
to connect an optional external bracket containing up to
six (6) USB 2.0 ports.
1.
Secure the bracket to either the front or rear panel
of your chassis (not all chassis are equipped with the
front panel option).
2.
Connect the end of the cable(s) to the USB 2.0
header on the motherboard.
Table 4. USB 2.0 Header Pins
Connector Pin Signal
USB 2.0 Header Connector
1 5V_DUAL
3 D-
5 D+
7 GND
9 Empty
Pin Signal
2 5V_DUAL
4 D-
6 D+
8 GND
10 No Connect