SP/DIF is the standard for transmitting pcm/ac3 through a digital line to an external decoder, and your computer has an optical out, that's why it says you have one, it's just the wrong one.
if you really like that receiever, you can get a sound card with a coax spdif output pretty cheap.
and like the previous poster said, you'll only have surround sound for movies encoded with ac3 sound. everything else will just be 2-channel pcm 44/48/96
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