This pci express based serial adapter card allows you to turn a pci express slot into eight rs232 db9 serial connections the adapter card is based on a native single chip design that allows you to harness the full capability of pci express pcie providing optimum reliability and speed and reducing the load applied to the cpu by as much as 48 over conventional serial cards the rs232 serial adapter card is compatible with a broad range of operating systems including windows 2000xp2003