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I need to determine how many individual USB 3 controllers/buses are on a PC. The PC in question is a Gigabyte Brix GB-BXi7H-5500.

I plan to use this with a Microsoft Kinect v2 sensor, which is a USB 3 device and needs to be on its own USB controller. If there are multiple USB 3 controllers in the PC, I would like to be able to plug in an external USB 3 hard disk as well - but I want to make sure that this doesn't interfere with the Kinect.

The PC in question runs Windows 8.1. I've checked in Device Manager under 'Universal Serial Bus controllers' and I see the following: Screenshot of Device Manager with the USB controllers node expanded

But I'm not sure how to interpret this in terms of separate controllers/buses. Is there a way to know for sure?

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You have a single USB3.0 controller - the "USB 3.0 eXtensible Host Controller".

According to Intel (Page 48 of the document):

The PCH contains one eXtensible Host Controller Interface (xHCI) controller and two Enhanced Host Controller Interface (EHCI) controllers. The xHCI controller is mapped as PCI D20:F0 and it supports up to 14 USB 2.0 ports of which 6 can be configured as SuperSpeed (USB 3.0) ports.

EHCI controller 1 (EHCI1) is located at D29:F0 and it supports up to 8 USB 2.0 ports.
EHCI controller 2 (EHCI2) is located at D26:F0 and it supports up to 6 USB 2.0 ports.

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    Thanks. So in future, if I want to find the number of controllers on a given PC, I should just look for the number of 'Host Controller' entries under the USB node?
    – John
    Jan 12 '15 at 23:07

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