Startechcom 4 port pci express pcie rs 232 serial adaptor card startechcom pex4s952lp the startechcom pex4s952lp 4 port low profile native rs232 pci express serial card turns a pci express slot into four rs232 db9 serial connections the card is constructed using a 16950 uart native single chip design that lets you harness the full capability offered by pci express pcie while reducing the load applied to the cpu by as much as 48 over conventional bridge chip serial cardsthe card is