PCI EXPRESS PCIe RS232 SERIAL 2 PORT CARD with   Low Profile Bracket  (SUPPORT Vista & Win7)

PCI-e one chip solution(Moschip MCS9901CV)

It's real COM Port in your computer, not USB to COM port
  high compatible with serial type device.

FEATURES

* 2 independent RS-232 serial ports with communication speeds up to 430Kbps
* Designed to meet PCI-Express Base Specification Revision 1.1
* Supports x1,x2,x4,x8,x16（lane）PCI-Express Bus connector keys
* High speed 16C550 compatible UART controller on-board
* On-chip hardware auto flow control to guarantee no data loss
* Built-in 16 byte hardware FIFO & 256K byte DMA software FIFO
* Support DOS,Linux,MAC,Microsoft Windows 2000/XP/2003 and Vista