This is how far I have made it.

Ok I am working on a gaming/htpc. I want to hook up a a/v receiver that does dolby true-hd/dts-hd. The graphics cards I have are 9800 gtx's in sli mode. I have a nvidia 780i mobo. I know to do the HD audio formats I need an HDMI source that carries audio and video, and Software to get it out of the pc.

Ok so I set up the graphics cards and used a 2 pin spdif cable and linked the spdif header on the mobo to the spdif input on the graphics card. The card has 2 dvi outputs. I used a dvi to hdmi adapter then hooked an hdmi cable between the tv and comp. Now before anyone says this will not give you sound because you are using a dvi to hdmi dapter, yes it will because my TV Speakers work just fine. I am also getting 1920x1080 res.

I am using cyberlink power dvd with blu-ray playback. It does the HD audio.

So the question is if I hook the HDMI into the receiver that I haven't bought will it see the audio as HD audio or just regular dolby digital? The reason why this is important is because if it is just going to see dolby digital I would get the same affect going with a cheaper receiver and using the optical output from the mother board.