Asus RS724Q-E6/RS12 - Manual (Page 58)

4-12 Chapter 4: Motherboard information
2. USB connector (5-1 pin USB3; A-Type USB4)
These connectors are for USB 2.0 ports. Connect the USB module cables
to connectors USB3, 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.