StarTech.com 2 Port RS232 PCI Express Serial Card with Breakout Cable PEX2S553B Lower CPU load of native single-chip, single lane PCI Express design ensures optimal system performance (up to 48% less CPU load) Included standard and low profile/half-height brackets makes this the perfect card for any application including small form factor embedded applications Breakout cable design means that only one expansion slot is needed to add 2 serial ports to any system Full profile and low profile/half-height brackets included Native single-chip design Single-Lane (x1) PCI-Express with throughput up to 2.5Gbps On-chip 256-byte depth FIFO in transmit/receive path of each port Supports hardware and software flow control