Add 2 rs 232 serial ports to your full height or low profile computer through a pci express slot the pex2s952 pci express based serial card turns a pci express slot into 2 rs 232 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 while reducing the load applied to the cpu by as much as 48 over conventional bridge chip serial cards the rs232 se