I consider the minimum playable FPS for my games to be:~30
I consider the maximum FPS that I can perceive to be happening:~70
I consider the 'limit' the eye can see to be around 30FPS: no
I consider the 'limit' the eye can see to be around 60FPS: no
I consider the 'limit' the eye can see to be higher than 60FPS: yes
I've used a lab strobe in the past that's good to 300Hz, I can "see" up to 250Hz using that thing but hell it makes me nauseous.