An i5 4670K is going to be in a lot more gaming systems than a I7 5960X, those results are also pretty impressive. Hey guys Mantle reduces CPU dependency so lets test it on a $1000 CPU...
The test on Anand Tech was with a 4770k (certainly not a 1000 cpu) and only showed about 10 pct max, while the other one with 4670k showed 25% or so. I pretty much disregard the 768p tests. I really hate to see those coming back just to show artificially high differences (game.gpu is starting to bring them back for some games too).
I dont think anyone with even a mid range system is going to be playing at 768p, especially in a game like this where you dont need a super fast framerate.
We really need more data to see how mantle shakes out in this game. Like every other game it has been in, depending on how you manipulate the conditions, improvement can be from minimal to 40%. And if AMD is not optimizing their Dx drivers for mantle games, a true comparison becomes very difficult because you then have to compare Dx on nvidia and mantle on AMD.