A Quad Channel 4 Gb Fibre Channel PCI Express card is required to connect Xserve RAID to a Mac Pro or Xserve (Intel-based) with a PCI Express bus. The Fibre Channel PCI Express card is installed in your computer & the cables are used to connect to the SFP port on Xserve RAID with SFP connectors. This card runs at full bandwidth in an eight-lane PCI Express slot. A quad-channel card is ideal if your computer is slot-constrained or if you want to connect two Xserve RAIDs to a single host computer without the expense or complexity of connecting through a Fibre Channel switch. SFP connectors on the card allow use of copper or optical cabling & provide the capability of directly connecting to Xserve RAID or Fibre Channel switches over long distances up to 500m. The Apple Fibre Channel PCI Express card offers leading performance & compatibility with Mac OS X & Xserve RAID.