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03 Jul 2012  

Windows 8 Professional

Long shot, but try pulling the 3.0 card, uninstalling all the drivers, and then rebooting the system. Then reinstall the card and its drivers fresh. If this provides no solution, there may be damage to the 3.0 aspect of the card itself, as the difference between usb 2 and 3 is extra data path(s) which may have become corrupted in some fashion.
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