Has anyone got the Realtek device that is inbuilt into the Radeons working in OSX?

I've tried to do a codec dump from ubuntu but not much comes out other than a Realtek ALC6xx device.

I have an ATI HD3850 running and I want to use the HDMI connection to plug into my TV but with the Audio also going over the HDMI connection. To do that i must disable the onboard sound card (ALC1200 in this case) and use the ATI built in option.

Anyone got that working????

Cheers