So I just got BF1 and i'm getting a solid 60fps easily on high / custom mix of settings. I have a 270x (480 arrives tomorrow), i5 4460 & 8gb ram. I got 100+fps on medium and I think high stopped around 70, but then I lock it to 58. I noticed games run better locked right under 60
The 460 should perform rouglhly the same as a 270x. I want to say that a 460 will perform better than a 270x. I was also running in DX 11 during my test.