Should I go with Dual SLI GTX 960 2GB's or a single GTX 970 4GB?

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Jul 19, 2014
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Basically title, though I would need to get a new motherboard and copy of windows for the first option.

Oh yeah and also, I already have one GTX 960 2GB, so would it be more worth it to get another or to get a single 970 4GB.