I was using the onboard sound on my 780i, and then I found a razer barracuda AC-1 on woot for $50. Since I run fiber to my receiver, I noticed a huge difference immediately! With my onboard sound, regular windows sounds, Hulu, music, etc, would only output in stereo, but with the AC-1, it outputs in real-time Dolby Digital Live! and DTS, which sounds fantastic. I would say try to find a decent dedicated sound card.