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Can someone explain the APU crossfire idea?

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#1
I have been out of the loop for a while, and I just recently started learning about the new AMD APUs. To make this more complicated, I have heard some people talking about a crossfire configuration with a GPU and the APU. This is extremely confusing for me. Can someone help explain this? I just purchased a A4-4000 and a R7 240, which is a large part of the reason I'm asking this question.

Thanks in advance.
 
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#2
It's kinda like the hybrid multi GPU config some laptops use but with AMD's APUs it will only work with up to so powerful a video card. Something like 7770 I think is the highest video card you can go with as far s I know.

So basically it gives you good bang for buck in a budget gaming PC price range, but beyond that point it can't compete because you lose the hybrid option with higher end video cards.