Why the hell can't I see my phone under My Computer when USB 3.0 is plugged in?

My ports are working fine ,it charges on it fine, the cable is tested fine, downloaded Kies and re-installed the USB driver, enabled/disabled USB debugging...why can't I transfer these Gig sized Dedoxed ROMS quickly using the USB3.0 port instead of 2.0 (works perfectly).

ANy suggestions?