Bus Type: 32 Bit PCI Speed: Up to 480 Mbps Chipset: Via VT 6212L Silicon fuses provide protection for each port USB 2.0 & USB (Universal Serial Bus) 1.1 compliant Connectors: 4 x Type A USB (Universal Serial Bus) Female (External) + 1 x Type A USB (Universal Serial Bus) Female (Internal shared) Software Compatibility: Windows ME/2000/XP/ Vista/ Windows 7/8/ Server 2003, 2008 2 year warranty