Audio over DVI

I'm wondering, how does this work? Googling didn't help much -- some people say it cam't happen, but the best I found was a wiki article that suggests it is possible to send HDMI-formatted packets over a DVI (single-link at least). I'm assuming the display must be HDCP to enable this mode?

I have a GTX-580, and it shows there are 4 different Nvidia HD audio devices in device manager. NVidia control panel shows DVI(1), DVI(2) and HDMI, so I don't know what the 4th device is?

I have tried both DVI connectors on the GTX-580 to my Samsung HDTV DVI input and they both work. The only option in windows 7 sound manager is for stereo, I'm assuming it's just LPCM. don't know if it is possible to output other audio formats over the DVI. Win 7 sound manager shows HDCP: supported, Bit Depth: 16-bit and 24-bit, and Sampling Rates 44.1 kHz and 48.0 kHz.

The built-in TV speakers suck for FSX compared to my fairly cheap desktop setup (L+R with sub) driven by the MB Realtek HD audio device.

scott s.

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