What happens when a game does not support SLI ?

Deralinoux

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Jul 8, 2014
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Hey guys !
Excuse me for the very noobish question, but I've been looking everywhere I could and did not find a clear enough answer, so I figured I'd better ask it directly here... It's all in the title: Does, as I've been assuming so far, lack of SLI support mean that the game will only exploit one of the two (or more) GPUs ? Or does it imply that the game will get additional performance issues that would not have been present if one had been using the same GPU individually, or maybe even not work at all ?
Thank you for your answers !