This pci express rs232 serial adapter card adds an rs232 db9 serial port to a computer through an available pci express slot while relying on a native single chip design oxford oxpcie952 that harnesses the capability of true pci express ensuring maximum performance and reliability and reducing the load applied to the cpu by as much as 48 over conventional serial cardscompatible with a broad range of operating systems including windows 2000xp2003vista and linux kernel 2611 and up