The DVR cards on the market today ship in the form of PCI add-in cards. With the increasing number of PCIe based PCs now shipping, the number of PCI slots is slowly diminishing. The PEX 8111 supports up to a 66MHz 32-Bit PCI bus and converts it to a single x1 lane of PCI Express in Forward Mode. In Reverse Mode, the PEX 8111 allows PCIe native silicon to bridge back to a legacy PCI system.