Mike,
What dmdilks stated is 100% correct.
In addition, specific to your board:
Chipset: 1.Up to 4 USB 3.0/2.0 ports (2 ports on the back panel, 2 ports available through the internal USB header)
* In Windows XP, the Intel USB 3.0 ports can support up to USB 2.0 transfer speed.
2.Up to 6 USB 2.0/1.1 ports (available through the internal USB headers)
VIA VL800 chip: 1.Up to 4 USB 3.0/2.0 ports on the back panel
* Due to a Windows 7 limitation, please connect your USB device(s) to the Intel controlled USB port(s) (located below the RJ-45 LAN port) before the VIA USB 3.0 controller driver is installed.
Ultimately, the MB manufacturer can decide how support is implemented.