The difference between a 1070 and a 980 Ti is very small. I've wondered something about Nvidia and DX12/Vulkan, in that did Nvidia really fix Async Compute, but only applied that fix to Pascal? At 4k the Pascal cards perform just like the Maxwell cards with Async Compute, and get very little at 1440p and 1080p. I thinking Nvidia fixed Async Compute for Maxwell but only gave it to Pascal cards. By fix I mean they found a work around.