StarTech.com PEX4S952 - 4 Port Native PCI Express RS232 Serial Adapter Card with 16950 UART

This PCI Express serial adapter card allows you to turn a PCI Express slot into 4 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 and reducing the load applied to the CPU by as much as 48% over conventional serial cards.The RS232 Serial Adapter Card is compatible with a broad range of operating systems including Windows 2000/XP/2003/Vista Linux Kernel 2.6.11 and up as well as Mac OS 10.4 and above.Plus the adapter card includes an optional low profile/half-height bracket that allows the card to be installed in virtually any computer case - making it that much easier to add serial ports to a PCI Express enabled computer regardless of the size of the computer case.