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I'm not sure how you can do this through Device Manager, though if you check each USB root hub instance you will be able to see how much power is available per port and if you check the properties of each instance of the host controller you can see how much bandwidth is allocated to each port. If you plug in your usb 1 device you can then do a comparison of with/without. That may give you some idea as to what is happening.
If netwolf pops in or one of the other techi - gurus they will be able to enlighten you more accurately. I'm a bit of a neanderthal in this area.
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