I recently moved from a 690 to a 980. Really didn't notice any improvement. CPU is the bottleneck. My experiences are not scientific. Simply subjectively observed.
From the few limited other apps that I have seen, ED really didn't put a ton of work into implementing the DK2 into its current engine. If I recall, at first, they simply refused to consider Rift support. I'm glad they changed their minds.
However, I think that they did the minimum required to get the code to accept rift support, opting rather to roll resources into EDGE and improve the experience there.
Better performance is just around the corner. 2-3 weeks. [emoji1]