(My apologies. I realized there was an HTPC subforum after I posted this. This may fare better there.) Building a new home theater system and had questions on pushing audio with GTX 580 via HDMI. I do not have a dedicated sound card. Will any audio quality or surround sound decoding capabilities be lost by connecting the computer to the AV receiver from the GTX 580 via HDMI? I saw a couple postings saying the GTX 580 can't do "bitstream audio" but I don't know what that means or if it applies to this situation. Will passing the audio through the GTX 580 affect it's graphics performance at all in any way? Thank you for any help you can offer. I really appreciate it. UPDATE- I've done a little bit more reading. Am I correct in saying that the audio passed through the HDMI from the 580 to the receiver will not be touched or modified at all by the card? The GTX 580 will send a purely digital signal to the receiver and the receiver, not the video card, will handle EVERYTHING to do with the audio? The untouched audio simply gets to the receiver via the card. The receiver then does the work. Correct? Or is this incorrect the because the 580 is incapable of sending raw, untouched audio via HDMI to the receiver and that's what bitstreaming is? And if the GTX 580 can't send raw audio does that mean it is incapable of sending DD or DTS surround sound to an audio receiver? If there is no way to properly connect the GTX 580 to the AV receiver for proper surround sound my motherboard is a Asus P8P67 Pro REV 3.0. Is there any way to connect that to the AV receiver for proper DD and DTS audio?