How much bandwidth does a Fury X have compared to the next best card lol.
If that amount of bandwidth is not doing the job @1080p by a wide margin then it does not take much working out where the problem is !!!!
Clockspeed
Yet the mantle comparison shows it is fine. which you keep ignoring, not a matter that the GM200 cant use mantle. what matters is that the FX is beating itself by 25 - 30 fps at 1080p in mantle. compared to dx11 in the reviews.