You left out one piece of information: where? Frame rate in AH3 is dependant on the view. Flying at altitude it's easy to get 60fps even with everything max; my ancient system does. Try on the ground, say tower view at V59 on CraterMA with max zoom (Z + max on the [] keys). Your GTX970 will probably handle that higher stress just fine. I'd be interested in that result; although to be honest, I'm satisfied with the bunny with a pancake on his head.
