Getting sound through my graphics card.

I built my first mackintosh recently. It's working well.

I just can't find a guide on getting audio through display port or hdmi on my GTX660.

Any help would be appreciated.

edit: Also, I noticed it does screen extending with an apple tv and that does sound. How cool is that? I thought that would only work on an official mac.

submitted by OriginalTrollPoster

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What am I missing? Is it really as easy as the steps outlined above? Please comment to help me do this right guys! ...source