I have a ASUS M5A88-M Motherboard and I planning to expand my usb connections.so what i have is AMD SB850 controller : 12 x USB 2.0 port(s) (4 at back panel, black, 8 at mid-board).I can see the 4 at the back but how will I use the 8 usb ports ,what device I need to add to function this. If...