Just wondering as the first Mantle driver said it wasn't optimised for the 280X's but the subsquent ones haven't been clear.
On BF4 I've tried each new Mantle driver and I'm sure performance on it gets steadily worse. On DX12 I get a stable enough 60 fps on ultra & 2xmsaa, but on Mantle its never been any good. On this latest version at any point there's any action it takes the fps right down to 30 and locks it there, stuttering along!
Right now Mantle is a complete no go for me.