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MacHeadCase
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From what I found in Google, PCI Express sound cards do exist for the Mac Pro but they are mostly for either recording studio work or high-end video editing.

But at Apple there is this Knowledge Base Article, Mac Pro: External ports and connectors:

Quote:
Optical digital audio in/out port:

Connect to decks, recievers, digital instruments, and 5.1 surround-sound speaker systems using standard Toslink cables or fiber-optic cables with a 3.5 mm plastic or nylon optical plug. You can transfer stereo or encoded 5.1 audio using the S/PDIF (Sony/Philips Digital Interface) protocol and Toslink cables.
Click on the link for more info.

Hope this helps. :girl:
QUOTE Thanks