Asus ESC4000/IB - Manual (Page 64)

4-10 Chapter 4: Motherboard information
2. USB connector (10-1 pin USB45, A-Type USB3)
These connectors are for USB 2.0 ports. Connect the USB module cable to
connector USB45, 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.