So I'm getting the asus z87 pro this friday and while I was watching the review for it everything seems to be good except when they showed the USB's at the back their all 3.0 boost? Can I still plug my mouse & keyboard? I'm no computer expert sadly so I don't really understand & I have an extra HD where I put my files/music/movies/backup if needed. would they still work on the 3.0 boost usb ports? 4 on top and extra 2 on the bottom. Can I put my mouse & keyboard on the 2 ports only and my HD (Not sure if this HD supports 3.0 ports? its a WD Passport) on top for transferring files?