So I was messing with the restoration glitch and enchanted a neclace with fortify health 7,148,545. I went to a mountain and jumped off, Took no damage. I took the neclace off and jumped again, I died.
For those who do not believe me http://m.youtube.com/watch?v=5AIUPZh4OwY&feature=plcp
Its not really no fall damage. You took fall damage but your health was so high that you didn't notice the drop. The equation for fall damage is Player falling damage = ((height - 600) * 0.1)1.45 * modifiers