Asus Rampage III Black Edition - Manual (Page 67)

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!
3. USB 2.0 connectors (10-1 pin USB78; USB910)
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.
Connect the ThunderBolt card to the USB connector.
ASUS Rampage III Black Edition 2-35