specifically while fast turning, the eye can see up to 100, perhaps even more for the individual here and there.

It's still a minor increase tho and the difference would hardly be noticable, but if you can get 100ish fps, try it out and turn fast in wow. I'm positive you should see the difference. (I do!)

But is it needed? Nah. :P 20ish FPS is already playable enough really.