Hi. Putting together an HTPC. I know htpc video card (EVGA GTX460sc) supports HDMI out and bitstreaming. What I don't know when hooking up is what to do with it. Primary q, is: does it do all the lifting as far as sound that my TV needs? Do I still need a sound card, and if so, how to set them properly to work together and send sound out from the htpc. Thank you all!