Been playing with my chillframes FPS limit at 40 recently; trialling the 'recent' idea that 40fps is the suitable midground between 30 and 60+ (for unimportant running about, etc - uncapped I sit well over 120fps for buttery smooth errythang)
And I gotta say, it's a marked difference over 30, and not far enough removed from 60 to be awful, while still saving significantly on power draw/temps, and the input lag difference between 30 and 40 is huge compared to 40 to 60.