This 4 Port RS232 Mini PCI Express Serial Card with 16650 UART turns a mini-PCIe slot into four RS232 (DB9) serial ports with data rates up to 921.6 Kbps. It is a cost-saving solution for adding serial support to embedded systems missing the functionality. A native PCIe single-chip design enables you to take advantage of full PCI Express bus capability, by providing improved speed and reliability while reducing the load applied to the CPU by as much as 48 percent over conventional "bridge chip" serial cards.