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Is your GTX680 still under warranty?? It might be worth RMAing first.
Plus the AMD refresh should be released in the next month or so and I suspect Nvidia will probably release its next card too. Hopefully at least the new AMD releases will push the price of the GTX980 down a bit.
This fella does not like that card very much:
Wrong time to be buying. The 390X will beat it comfortably. Even if you had to wait a few months it would be worth it.