I can tell you that I also have a GTX 1070, i7 4770K default clock but turbo OC at 4.2GHZ, 32GB RAM memory. IF I am at a terminal at KJFK payware airport, my FPS are in low teens, at LOWI on a runway they are about 30. Flying over the ocean with about 55% cloud cover they are about 60. This is all with X-Plane 11. The only way for me to get reasonable FPS at KJFK is by turning off shadows to static.