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4 Port PCI Express Serial Cardthe Pex4s553b 4-port Pci Express Serial Card (with Breakout Cable) Lets You Add 4 Rs232 Serial Ports Using A Single Pcie Expansion Slot. The Pcie Serial Card Includes A 1-to-4 Break Out Cable, Which Enables You To Add 4 Serial Ports To A Single Low Profile Slot.the Serial Adapter Card Features A Native Single-chip Desi..