StarTech.com 2S1P Native PCI Express Parallel Serial Combo Card with 16550 UART (PEX2S5521P) Standard and low profile bracket included ensuring easy installation into almost any system Native single-chip, single lane PCI Express offers increased speed and reduced CPU load by up to 48% All three ports share only one IRQ, minimizing system resources required for the card Two high speed RS-232 serial ports with data transfer rate up to 460.8 Kbps One parallel port with data transfer rate up to 1.5 Mbps Compliant with PCI Express base specifications revision 1.0a 128-byte deep FIFO per transmitter and receiver Configurable in 5V, 12V, and RI (non-powered) modes.