Asus P9X79-E WS - Manual (Page 54)

You can connect the front panel USB cable to the ASUS Q-Connector (USB, blue) first, and
then install the Q-Connector (USB) to the USB connector onboard if your chassis supports
front panel USB ports.
Never connect a 1394 cable to the USB connectors. Doing so will damage the
motherboard!
5. USB 2.0 connectors
(Type A: USB13; 10-1 pin USB1112; USB13)
These connectors are for USB 2.0 ports. Connect the USB module cable to any of
these connectors, then install the module to a slot opening at the back of the system
chassis. These USB connectors comply with USB 2.0 specification that supports up to
480 Mbps connection speed.
2-30 Chapter 2: Hardware information