I think you would see a huge increase. A 980 walks all over a 680. Now to see the difference you would have to be using a monitor or monitors where you are not using vsync.
I went from a GTX 770 to a GTX 970(then another in sli) and the difference is incredible. if im not mistaken, the 770 had a 680 gpu just overclocked.. So im sure you'd be very happy with the performance difference.
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