Looking at benchmarks, although I can't find any involving a 1080, it appears that the difference in frame rate between these two CPUs is only marginal with the 6700 coming out on top only by a few frames and for £50 extra it doesn't seem like it would be worth getting an extra 4 fps or so for that price, given that I will also have to buy ram now as well. I'll have a look now for some benchmarks with 1080 cards.