Detailed guide on how to enable & optimize nVidia SLI. Here I will explain why some people do not get 2x performance with SLI setup and explanation on how to achieve this. If someone tells you that SLI will not give you 2x performance, they're wrong. It's very possible.

With single GTX 680 I get 20-26fps in Crysis 3 on ULTRA, with 2x680 i get 40-52 fps, clearly 2x performance.
Trick is to make sure that both cards run the same and give same performance, if you have 2 exact same models, that does not mean that their BIOS / Firmware is same, it has to be tweaked to match the other card.
Learn here on how to do this!

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