Spballer -
I am at work right now, being slightly unproductive, thinking about the current state of my Hackintosh with no audio, and I think I have found out why your Audio works and my doesn't! It boils down to the fact, I think, that you got your audio working with the on-board graphics enabled PRIOR to configuring your graphics card and you did not rely on native support in the OS for your GPU like I did.
So I went down the Google rabbit hole trying to find out how to disable NVIDIA’s HDMI Audio in the graphics card and lo and behold I ran across this article but for LINUX -
http://techgage.com/news/disabling_nvidias_hdmi_audio_under_linux/
Seems like this has been an annoying problem going back for quite some time now! What was cool though is I did get WoW to work albeit still with no sound because DPCIManager "suggested" that I install some Voodoo kExt, which when I did showed 4 "optical" Output devices (and no Input devices still)! I choose the first one on the list, closed out System Preferences>Sound, fired up the game and BOOM! Blizzard trailer (which looked gorgeous btw)!!
I am trying to avoid as much as possible having to do a re-install, so what I am hoping to do is:
1. Remove the Voodoo kExt
2. Re-enable onboard audio
3. Re-enable onboard video
4. Start system bypassing video card
5. Run Multibeast, selecting ALC1150
6. Restart system and verify audio works (Please, please, please! like James Brown)
7. If all good here, I am going to follow path for Web drivers for my 780 GTX! (can't hurt to stick to the script from here on out)
8. Disable onboard video, fire up with no flags! (fingers crossed!!)
I may just try one interim step and enable onboard audio with Voodoo still loaded and see if it picks up any additional working audio devices; it's worth a shot at least. Because then I can at least test that audio works fine under Voodoo!