As others have said I really don't have any issues with anything else. GTAV runs low 40s to high 50s now that I replaced my Mobo and my CPU is clocking correctly and Pcars runs jammed at 60 FPS too (Titan Black SLI 4k) but Witcher 3 runs like total dog toffees.
I can get low 40s with medium settings and hairworks off but it doesn't feel very nice. It's not stuttery but I can definitely feel the frame drops.
As others have said I will welcome any other gains
Even though Nvidia have said they didn't do this deliberately I'm totally not having it. They screwed Kepler waiting for the impulsive lot to jump to Maxwell and have no doubt made money by doing so.
So I'm sorry, I totally don't believe that this wasn't deliberate.
I'm just glad it wasn't Fallout 4 because no doubt I would have crumbled and bought two 980s.