I have a mobo that supports optical out, along with a GTX295 that has HDMI. The problem is, I broke the S/PDIF connector pins on the GPU, so I can't connect it to the mobo pins. I need this cable for sound-over-HDMI to work, correct? The second question - I am connecting to TV and home theatre, by the way - is what's the go with the optical? I did try for about half an hour, but no dice. The Yamaha receiver simply didn't get any sound out of it (TV optical out works). I did change audio output in windows, tried 'HDMI - no audio' mode in Nvidia settings, etc. Is there some sort of option that is overriding my mobo optical out with the (faulty) HDMI out on GPU? I'd love to get this working.. Edit: Third question.. I am of the belief that the optical will only give me 5.1 in games if the receiver and game are both in a supported format, e.g. Dolby something-something. Is HDMI bound by these same rules?