I don't think it uses that usb 3.1 chip. From the driver page it uses: Asmedia USB 3.0/3.1 XHCI Driver ver:1.16.23.0
http://www.asrock.com/mb/Intel/Fatal1ty Z170 Gaming-ITXac/?cat=Download&os=All
Yep, looks like it. I was hoping that it was the Alpine Ridge controller, but since they posted the specs for the board it seems like it's confirmed to be the Asmedia controller.