Product Detail PCI Specification Revision 2.1 compliant Compatible with standard 16C550 UART with 16 byte transmit-receive FIFO Fast data rates up to 1 Mbytes/sec DB9 serial port connector x 2 Pin header serial port connector x 2 . The "Cables Unlimted 4 Port DB9 Serial Netmos 9835 Chipset PCI I/O Card" is best product for you. We recommended Cables Unlimted 4 Port DB9 Serial Netmos 9835 Chipset PCI I/O Card