ARK has gone from DX11 to DX12 using the unreal 4 engine i have seen a 40% increase in performance it looks much nicer as i am able to crank up settings more than normal not noticing much frame rate loss looks better than before.
I hope developers start switching over to DX12 soon including morpogs thing is you don't need to go out to buy a new video card for dx12 from geforce 410m on up are supported and AMD
AMD E1/E2/A4/A6/A8-6000 Series APUs (codenamed “Beema”) on up supported.