I have a Mac Mini Server 2.0 (mid-2011). It has USB 2 ports. I am wondering if there is any way to upgrade this system to USB 3. This may be a naive question because I don't know where that technology is located - on the motherboard or elsewhere. For all I know, maybe it's just a card with the ports on it and the USB speed is not determined by the motherboard. If it's a card, can it be replaced with one for USB 3? Or is there another solution?