Startechcom 2 port pci express pcie to rs 232 serial cards startechcom pex2s952 the startechcom pex2s952 pci express serial card turns a pci express slot into 2 x rs 232 db9 serial connections the adaptor 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 cardsthe rs232 serial adaptor