StarTech.com 4 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART Add 4 RS-232 serial ports to your standard or small form factor computer through a PCI Express Expansion Slot 4 Port PCIe Serial Card 4 Port RS232 Card 4 Port Serial Adapter 4 Port PCI Express Serial Card Native single-chip, single lane PCI Express chipset delivers true PCIe performance, up to 48% more efficient than bridge chip designs Standard and low profile/half-height brackets included to ensure fitment in any system Four high speed RS232 serial ports, with support for data transfer rates up to 128000bps 256-byte deep FIFO per transmitter and receiver Native single-Chip, single lane PCI Express Includes half-height/low profile mounting brackets Built-in 16C450/550 compatible UART Compliant with PCI Express Base Specification 1.1