You should care if you like smooth gameplay. All those little annoying glitches and pauses in game play is what frametime variance is all about. I mean if your getting 40fps you have bigger problems, but once you get to a smooth rate it matters.
this is what i thought until i went wait... thats frame rate..
so why is the system hitting higher overall average frame rate with less ram, then with more ram... :\
If you compare the first and last graph, the first graph has a higher overall average frame rate, while the bottom graph has a smoother frame rate.
To me something about that test does not seem right, or its flawed in some case.