StarTech.com 4 Port RS232 PCI Express Serial CardThe PEX4S553B 4 Port PCI Express Serial Card (with breakout cable) lets you add 4 RS232 serial ports using a single PCIe expansion slot, with an included 1 to 4 cable enabling you to add 4 serial ports to a single low profile slot. The serial card features a native single chip design that provides optimum reliability and speed, reducing the CPU load by up to 48% over conventional bridge chip serial cards a cost effective solution for connecting legacy