Sunix's 4037T PCI card allows user to add two serial ports or expand their serial connection. The port has a data transfer rate up to 921.6 Kbps, which is ideal for use with connecting a serial modem, POS device, GPS, ISDN terminal, and etc. on your system. Bundled with the card is Sunix's unique software which allows user to increase the FIFO memory size up to 128Kbyte for maximum system performance.