Because of their inferior DX11 drivers compared to Nvidia.Seems like AMD got the biggest boost.
So can DX12.I'm pretty sure Mantle can see further gains though
Head to head while covering too little ground, not a good position to be in.it's about head to head with DX12 results at the moment.
DX12 will definitely make PC gaming even better (more efficient, even less powerful hardware to match/outclass consoles) and AMD have to be praised for having made the first step towards low-level APIs on PC.