That sure is a very small range and nothing like any video I have seen. I certainly do not see anyone else typically sticking to just a 5 fps variance on average. For example I get anywhere from 110 fps all the way down to mid 60s at times and that lines up with what I have seen in youtube videos.
Good example right here as he is anywhere from around 105 fps to around 70 fps on the 1080 Ti.
Big variation I never seen that many cards sampled at once I'm glad I upgraded to a 1080ti big jump from a 980ti even.
Just picked up a extra heatsink cooler and fan for my card if the fan ever decided to go bad. Plan on keeping it for two years anyway.