Which would be better for the long run?

Yahbe

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May 30, 2014
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Looking at a build i have so far which has 2 GTX 1080 SLI but ive also seen a Totan X Pascal can do almost as much with a single card but maybe 10-18fps lower.. looking to upgrade in about a year but was wondering which should i do or 3 choice wait a year and see whats newer?