My god... People don't know about computers sometimes...
Think of it like this:
If you have a 60ghz display, the most fps you'll see is 60. No more. Anything more is just a number on a screen. So there will be NO noticeable difference between 60-162791
If you have a 120ghz display, the most fps you'll see is 120. No more. Anything more is just a number on a screen. So there will be no noticeable difference between 120-162791
So, what yin is saying is essentially doing nothing, it's all in your mind. Putting the frames to the max it'll let you go in normal minecraft is doing the same thing. It's just not letting there be a cap on the fps of minecraft.