Diamond Radeon HD 4670 - No Audio Out, possible to enable MOBO sound?

I've been having some issues with my current computer set up. I am running two Radeon HD 4670's in CrossFire, but the only option for sound is through the computer's headphone jack (as there is no audio out on these cards). I am using a Gigabyte GA-Z68X-UD3H-B3 with built in Intel HD Graphics and Realtek ALC889 codec (supports High Definition Audio, 2/4/5.1/7.1-channel), and desiring to use its audio functionality so I can hook up to the home theatre (using the HDMI Out).

Does anyone know if its possible to use Motherboard sound (ie the HDMI out with Realtek), while still utilizing the CrossFire cards for video? (To my knowledge, Intel HD graphics are superseded by the Radeon HD's, which tricks the computer to not recognizing the audio option)

HAF X Coolermaster Case
Gigabyte GA-Z68X-UD3H-B3 Motherboard
2x4GB Patriot G2 DDR3
Intel i5 2500K 3.3Ghz Processor
OCZ ModXStream-Pro 600W Modular PSU
2 x Diamond Radeon HD 4670 1 GB DDR3 GPU
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More about diamond radeon 4670 audio enable mobo sound
  1. Go to the bottom right of your desktop;
    right click on the audio symbol ==> Playback devices ==> select desired output device ==> set as default ==> Problem solved.


    Edit: I forgot my coffee
  2. It is no longer an option once the graphics cards are plugged in. The sound device disappears.
  3. Maybe they're hidden? That sounds like a weird problem.
  4. I'm not entirely sure. Just to lay it all out there, here is the options when cards/no cards are hooked in:

    CrossFire enabled:

    1) ATI HDMI Audio
    2) ATI HDMI Audio (two cards, two options)
    3) Speakers
    4) Realtek Digital Output
    5) Realtek Digital Output (Optical)

    No graphics cards, just MOBO:

    1) DENON HDMI Out (this is the audio device I want)
    2) Speakers
    3) Realtek Digital Output
    4) Realtek Digital Output (Optical)
  5. Last thing to add, I've tried disabling the ATI HDMI Out options as well as Realtek HDMI options in hopes that a restart would yield no more problems... but no such luck.
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