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Wait till at least CES 2020 next week - a 980 Ti at least once clocked up there should still do fairly well.I realise this thread has been inactive for 5 months, however I am in the exact same boat.
I have a 3440x1440 screen and a 980Ti. At 1440p ultrawide it just cannot keep up anymore, yet there is no reasonable value upgrade route. A 5700XT perhaps, but still that is not even a 50% performance increase.