View device information in Device Manager
Next, confirm that Windows enumerated the host controller as a USB 3.0 controller. To confirm that, open Device Manager and locate the controller under the Universal Serial Bus controllers node. If Windows recognized it as a USB 3.0 controller, USB 3.0 eXtensible Host Controller is appended to the device description.
Reference:
http://blogs.msdn.com/b/usbcoreblog/archive/2012/06/27/how-to-determine-whether-a-usb-3-0-device-is-operating-at-superspeed.aspx
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