But it is needed to enjoy the effects of 120hz. Do you own a 120hz monitor? If you do you would understand maintaining a 120fps is just stunning. Response time and motion blur plus input lag reduced.
And looking at matt rresults he could enjoy a 144hz display with thief to its max effect. Something that dx can't offer.
So again yes it is needed.
I understand what 120Hz monitors are, and 100fps on 120Hz monitors is perfectly adequate.

