StarTech.com PEX4S553B - 4 Port RS232 PCI Express Serial Card with Breakout Cable

The PEX4S553B 4-Port PCI Express Serial Card (with breakout cable) lets you add 4 RS232 serial ports using a single PCIe expansion slot. The PCIe Serial Card includes a 1-to-4 break out cable which enables you to add 4 serial ports to a single low profile slot.The serial adapter card features a native single-chip design that provides optimum reliability and speed reducing the CPU load by up to 48% over conventional bridge-chip serial cards - a cost-effective solution for connecting legacy serial devices to PCIe-enabled computers.The multi-port serial adapter includes both full profile/height and low profile/half-height brackets for compatibility with standard and small form factor computers and is compatible with a broad range of operating systems including Windows 7/Server 2008 R2 2003/Vista/XP (32 and 64 bit) Linux Kernel 2.6.11 and up as well as MAC OS 10.5 and above.