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Ill be staying with my 970sli @ 1440p for the moment thanks
Nope, cause lets be honest. Going by past cards, there's so little between them when it comes to games. A few fps at best. Buy whichever card has the features you require.
On a serious note, I am happy with games I play at the moment on 970SLI@1440p. Including mostly maxxed Witcther 3 and Ultimate settings on GTA:V. But, and I'm sure this is, but apart from most enthusiast PC tech consumers who haven't recently bought a Titan X or 980Ti, I will wait till the beginning of 2016, when things will have settled, prices will have stabilized, drivers matured, the second hand market may even be viable.
Then and only then may I look at changing, 980ti SLI is appealing, but Fury X may also be worthy. Who knows.