Asus Z170-WS Manual page 48

9. USB 2.0 connectors (10-1 pin USB1112)
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.
DO NOT connect a 1394 cable to the USB connectors. Doing so will damage the
motherboard!
You can connect the front panel USB cable to the ASUS Q-Connector (USB) first, and then
install the Q-Connector (USB) to the USB connector onboard if your chassis supports front
panel USB ports.
The USB 2.0 module is purchased separately.
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Chapter 1: Product Introduction