The Asus HDAV 1.3 can bitstream HD audio via HDMI or via analog outputs using the daughter card that comes with the deluxe version. It comes with a special version of TMT2.X specifically designed to work with the HDAV 1.3. I believe TMT3 will also work with it. The HDMI output from your graphics card is routed through the HDAV card and the audio is transmitted via HDMI along with the video signal. I’m not sure if you can use just the audio output without running the video through the card as well. You can check the Asus website for details on the card. There’s also a long thread at the AVS Forums that discuss both this card and the newer slimline version.
