This product is either discontinued or we cannot get that from suppliers.
Startech PEX4S952, Port-4, Bus PCI Express, Data Bits 5, 6, 7, 8, FIFO 128 Bytes, Max Baud Rate 460.8 Kbps, MTBF 87,600 Hours, Connector 1 - PCI Express x1 Male, External Ports 4 - DB-9 (9 pin, D-Sub) Male, Included 1 - 4 Port Serial Card, 1 - 4 Port DB9 Break-out cable, 2 - Low Profile Bracket, 1 - Driver CD, 1 - Instruction Manual.
The PEX4S952 4 Port Native PCI Express RS232 Serial Adapter Card with 16950 UART allows you to turn a PCI Express slot into 4 RS-232 (DB9) serial connections.