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Each Kinect needs a separate USB bus dedicated to it. That's not USB ports it actual circuits. I've tried powered USB hubs to see if that helps but it's the bus addressing that's the key. I'm running two Kinects on my macBook Pro (2006). THe only other thing might be to get a good PCI-E USB card running USB 3. That might work on a PC. But it needs separate bus addresses for each camera. Remember you can have a USB hub with a lot of ports on one bus. That doesn't help.