Asus Z9PE-D16 - Manual (Page 48)

2-30 Chapter 2: Hardware information
5. USB connectors (10-1 pin USB34, USB56; A-Type USB10)
These connectors are for USB 2.0 ports. Connect the USB module cables to
connectors USB34 and USB56, then install the modules 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.