Asus TS300-E8-RS4-C - Manual (Page 75)

ASUS TS300-E8-RS4-C 4-19
4. USB connector (10-1 pin USB78; A-Type USB9)
These connectors are for USB 2.0 ports. Connect the USB module cables
to connectors USB78, 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.
5. USB connector (20-1 pin USB3_34)
These connectors are for USB 3.0 ports. These USB connectors comply with
USB 3.0 specification that supports up to 5 Gbps connection speed.
The USB 3.0 ports are backward compatible with USB 2.0 and also supports
fast-charging of supported devices.