Startech PEX1S553LP, Bus PCI Express, Chipset ASIX - MCS9922CV-AA, Ports-1, FIFO TX: 1 Byte, RX: 1-255 Byte (depending on mode), Max Baud Rate 460.8 Kbps, Connector 1 - PCI Express x1 Male, External Ports 1 - DB-9 (9 pin, D-Sub) Male, Internal 1 - LP4 (4 pin; Large Drive Power) Male, Included 1 - 1 Port PCI-Express Serial Card, 1 - Full Profile Bracket, 1 - Driver CD, 1 - Instruction Manual. The card is constructed using a native single chip design that lets you harness the full capability offered by PCI Express (PCIe), while reducing the load applied to the CPU by as much as 48% over conventional br