I have an i7-4970, 24GB RAM, and a 1060 6GB, and XP12 runs more than fine. On performance level, is at least on par with XP11, and will utilize your graphics card better. Also, Laminar works constantly to improve performance, and will getting better with every new update. Yes, you won't turn all sliders to max, but the experience is way better than XP11.
Moreover, the improvements in all fronts (FM, weather, visuals, etc) are so great, that feels a totally different sim.
By the way, I use my machine for aircraft development, and I have to run X-Plane in parallel with other heavy applications. Still performance is more than OK.