there are different theories out there, some saying bottleneck depends on resolution some does not.  I am posting gpucheck calculator to show you the average benchmark fps you would expect based on cpu and gpu match.  the calculator appears to show a fixed cpu impact on fps regardless of resolution, which is -20% in this case.  it is saying the cpu is slower than gpu and will pull down fps across all resolutions.  use it for reference only for whatever it is worth.
Hello, I have the Area-51 R2 desktop and I want to change the GPU. I want to know about the bottleneck of my CPU (Intel Core i7 5820k) with the Asus Radeon 6600 8GB DDR6 Dual and what problems I'm going to have in gaming?
Area-51 R2, bottleneck, i7-5820K, Asus Radeon 6600 8GB Dual