StarTech.com PEX2S952LP - 2 Port Low Profile Native RS232 PCI Express Serial Card with 16950 UART

The PEX2S952LP low profile/half-height PCI Express Serial Card turns a PCI Express slot into two RS232 (DB9) serial connections.The card is constructed using a 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 cards.The PCI Express 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 and ships with a low profile bracket installed but includes an optional full profile bracket that lets you add two serial ports to virtually any computer (regardless of the case form factor).