It works but not optimised for my HD7970 so performance is all over the place. There are a few issues with mantle and BF4 to such as the graphics not being quite right but this is a bug on EA's side. I do like what i see so far so hopeing a new driver with better suport for my card will come out soon. I have also been testing the star swarm benchmark and i have to say this is where mantle is showing its stuff, I get more stable fps and better average fps than i do in dirextx. Lowest fps seen using mantle in star swarm were around 18/20fps but in dx mode it droped to 8fps.