StarTech.com 2 Port RS232 Mini PCI Express Serial Card with 16950 UART MPEX2S952 (Green) Native single chip design means up to 48% less load on your CPU which is critical for small embedded PCs that use low power, low MHz CPUs The smallest form factor available for internally adding serial ports to any embedded system Backed by a StarTech.com free lifetime warranty Compliant with PCI Express base specifications revision 1.1a High Performance Dual Channel Oxford 16950 UART Native single-Chip, single lane PCI Express Two high speed RS-232 serial ports with data transfer rate up to 460.8 Kbps 128-byte deep FIFO per transmitter and receiver