What's the difference between using the dual-channel or quad-channel version in a video SAN setup?

We're looking at setting up a video SAN for 3 machines. Are the Dual-Channel cards sufficient or should we go with the Quad-Channel cards? What's the difference?

Apple Dual-Channel 4Gb Fibre Channel PCI Express Card

Apple Dual-Channel 4Gb Fibre Channel PCI Express Card

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2 Answers from the Community

  • Best Answer:

    A Dual-Channel 4Gb card will do for each MacPro in order to connect via the SPF connectors. Quad-Channels are mostly used on servers for redundancy and other specific cases. Going into Quad will not make the connection faster.

  • Dual channel and quad channel cards provide additional paths to the storage location, but you will not automatically double or quad the speed if you use all of the connections. As information is transferred it chooses one channel at a time as the pathway to the storage device for that particular file. Transferring one large file can take longer than multiple smaller files equal to the one. It will not split the size of a single file transfer over multiple channels. Changing to jumbo frames will have more of an effect than increasing the number of physical paths.