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How does SLI behave in games that don't support it?

Dash Lambda
By Dash Lambda
in Graphics Cards
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Ever since I got a second 980ti, I've been periodically screwing around with SLI for curiosity's sake.

 

In games that support it, it works great. In games that don't support it, I see one of two things: Some games only load a single GPU, but most put half the load on both.

 

The former is what I expected, but the latter is by far the most common, and also seems really weird. My guess is that it's actually doing AFR, but the developer's job is to tell it how to plan future frames, and since they didn't do that it's still just rendering one frame at a time. But, then, why do some games just ignore the second GPU entirely? Is it perhaps easier to make custom SLI profiles for games that already have AFR running?

"Do as I say, not as I do."

-Because you actually care if it makes sense.

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