They do scale, I didn't say they didn't.
What I said is that it's not a linear scale.
Bare in mind that my current resolution of 7680x1440's pixel count is in excess of the pixel count from a 4K display.
3840x2160 = 8.3 million pixels
7680x1440 = 11 million pixels
I did not spend £3000 to be able to run games at my resolution, I also don't need 6GB of RAM.
You also can not max your games out
Perhaps if you can, you tell us what fps you get on Crysis 3 maxed and what your memory usage is maxed.