DICE created three setups from low to high-end. Now I do have to make this statement; all setups seem to be CPU limited (which will benefit Mantle) which I find to be a little akward. You could say that this respect the DICE results are somewhat flawed and have been catered to make Mantle look good.
Entry-level gaming, mainstream gaming, and enthusiast gaming.
Entry-level Gaming - AMD A10-7850K APU, integrated Radeon R7 200 series GPU (512 stream processors, 720 MHz GPU clock) tested at 1280 x 720 pixels resolution. With Mantle, the game yielded about 14 percent higher frame-rates.
Mainstream level gaming - AMD FX-8350 with a Radeon HD 7970 run at 1920 x 1080 pixels resolution with 1x MSAA and "Ultra" preset. Here you'll notice a 26 percent higher frame-rates. However, AMD FX cores offer half the performance per core opposed to Intel Core series processors. Meaning that despite the good results, these tests still have been performed under a very CPU limited situation, and thus that explains the performance boost.
Enthusiast level gaming - An Intel Core i7-3960X CPU with two Radeon R9 290X (CrossFire) graphics. Now here again I find the choice in components versus game resolution weird, as it seems DICE created a CPU limited situation (two cards in Crossfire) at a relatively low 1920 x 1080 resolution, the game is set at "Ultra" preset with 4x MSAA. Here it made all the difference with an 58 percent increase in framerates.
Personally I feel that you do not invest 900 EUR worth of GPUs and 1000 EUR on a CPU and then will game at 1080P. The test would have been far more reliable if it was done at 2560x1440 with one card or Ultra HD with two cards.