Yes, but of course if your PC is USB 3.0 equipped and you only use a USB 2.0 cable you only get the 2.0 transfer speed. The cable on my GS3 is twice as thick as the old style cable which indicates it is probably USB 3.0
This is true, however you'd have to be crazy to have usb 3 hardware and incompatible cables.
To the best of my knowledge usb 3 cables only have two types of connectors and micro usb isn't one of them. (at least not the 'micro b' connector) So maybe the cable you have is highly insulated or shielded?
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