StarTech.com 2 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART (PEX2S552) Native single-chip, single lane PCI Express offers increased speed and reduced CPU load by up to 48% Data transfer rates of up to 460 Kbps for peak serial device performance Easy to install and use with full step-by-step instruction providing a hassle free serial solution Two high speed RS-232 serial ports with data transfer rate up to 460. 8 Kbps Compliant with PCI Express base specifications revision 1. 0a Includes half-height/low profile mounting bracket Selectable power output on pin 9 for the serial port 128-byte deep FIFO per transmitter and receiver