Star Tech.com 2 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART The PEX2S553 PCI Express serial card lets you turn a PCI Express slot into 2 RS232 (DB9) serial ports. Based on a native single chip design (no bridge chip) this 2-port serial adapter card means that you can harness the full capability offered by PCI Express (PCIe) & reducing the load applied to the CPU by as much as 48% over conventional serial cards. The RS232 Serial Adapter Card (PEX2S553) is compatible with a broad range of operating systems including Windows® 2000/XP/2003/ Vista™/ Windows 7/ Server 2008 R2 (32 & 64 bit) Linux Kernel 2.6.11 & up & MAC OS 10.4 & above. Plus the serial card
Includes:: an optional half-height/low profile bracket that allows the card to be installed in any PCI Express slot regardless of the size of the computer case..