Crossfire issues: not using both cards in some programs/games

I am running two HD 7970s in crossfire on my windows 10 rig. Through afterbuer I can see that both cards are working in tandem when bench marking and in most games. However, I have noticed in a few games, Skyrim mainly, that only the master is utilized when playing. The slave card usage does jump up a little bit when first loading different areas, however, it quickly drops back to zero and stays there.

Are there some games that just can't use crossfire? Is there some setting I am unaware of?

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