Full Details from Amazon.com : http://www.amazon.com/gp/product/B002RYTI7I?tag=onigi-20
StarTech.com 1 Port Low Profile Native PCI Express Serial Card with 16950 (PEX1S952LP)
High Performance Single Channel Oxford 950 UART
Less load on the CPU Up to 48 Less
Native single-Chip single lane PCI Express
Equipped with a low profile bracket for PnP support for Micro and Slimline PC form factors
128-byte deep FIFO per transmitter and receiver
Automated in-band software flow control using programmable XonXoff in both directions