The pex1s1p952 1s1p native pci express parallelserial combo card with 16950 uart turns a pci express slot into 1 rs232 db9 serial and 1 parallel port the combo card features a native pci express single chip design that allows you to take advantage of full pci express capability providing improved speed and reliability while reducing the load applied to the cpu by as much as 48 over conventional serial cards that use a bridge chip design this 1 port serial1 port parallel card offer