Even though the question of "how much fps the human eye can see" is actually broken up into various individual questions insofar as how how fps relates to our perception, it is not even that relevant. The feel and the responsiveness of the input is what matters most.
I have a 42" Samsung LED 240hz and with smooth motion feature on, all my games look to run around 60fps. Halo 4 looks awesome with a top of the line tv. Try upgrading your hardware noob. @N3xtG3nGam3r
Sooooo.....we have the exact same TV, I just have my terrible smooth motion turned off? *Scratches head*
If your model has input lag with the smooth motion setting enabled, chances are we don't have the same model. I don't know why people have a hard time understanding what this feature does. It smooths the frame rate. It's that simple. Games like crysis 1, skyrim, gears 1,2,3, halo 4, all run at ~30fps. With smooth motion on, the tv displays the picture at a rate that looks to be as smooth as 60fps.
What's there not to understand? Whether the game runs at 30 or 60, with the right tv, and setup, that number means completely nothing because it smooths it to nearly 60 with no hiccups or input lag.
Also, yea yea computer this computer that. I have my custom build listed in my sig, and it crushes anything 360 or ps3 is capable of.