For all those saying the human eye is limited by framerate that is false.
The Human eye streams what we see constantly, it works with a continuous flow of light/information.
The brain is what discerns between framerate and its a learned acquisition, i.e if you play at 120, 30 fps will be 1/4 of the framerate your brain is used to seeing and your eyes will pick out all of the details easily, it will look choppy.
Games need more frames then TV because realtime rendering results in sharper frames and little motion blur as opposed to TV which results in smoother frames to give the illusion of fluidity and motion.
In this day and age, with the Internet, ignorance is a choice! And they're still choosing Ignorance! - Dr. Filthy Frank