GamerBoy357 :
CelicaGT :
First question, what resolution? If you are at 1080p you *may* start to see some bottlenecking in some titles, 1440p less so, 3840p (4k) not really.
the CPU will bottleneck the GTX 1070 even on higher resolutions. the CPU still needs to tell the GPU to draw the necessary stuff and send it to the monitor. the speed of the CPU will still limit how many frames the CPU can command the GPU to draw.
4K is 2160p
Yes, but at higher resolutions/settings the GPU is taxed more, thus can render fewer frames, thus there is less demand upon the CPU to deliver data for said frames and CPU utilization drops. This is central to how bottlenecking is defined and can be reproduced easily. In addition it is part of the diagnostic process for determining where the bottleneck exists. There are of course exceptions to this, such as games that rely very heavily on CPU or "bad ports" which are really just the same thing. TL: DR Resolution and Software make the difference, and we cannot generalize.
Edit: Lol, got my vertical x horizontal mixed
thanks for the catch!