JacobsParts Protronix 2-Port USB 3.0 Low Profile PCI-Express Host Controller Card Low profile bracket for small form factor (SFF) computers Supports Windows 7/Vista/XP 32/64-bit, Server 2003-2008 32/64-bit Supports simultaneous operation of multiple USB 3.0 and USB 2.0 devices Supports 2 downstream ports for all speeds Molex power required