As Chazore said, there are times when the CPU limits the performance you get in games. That's why CPU reviews also look at their performance with games, and it's also the reason your choice of components needs to be balanced.
It was said, I don't know if it's still the case or not, that CPUs are responsible of how many frames you get while the GPU is responsible of how pretty those frames are. Obviously, the prettier the frames are, the harder the GPU needs to work, affecting your frames as well, but you get the idea.
Genres like strategy games and management/simulator games tend to be a bit more demanding for your CPU because there are a many more variables to take into account when it comes to render the frame (number of units, resources, AI controlled enemies, etc.)
With that said, CPUs are more likely to be a bottleneck at lower resolutions, which is why CPU reviews test them at 720p, while GPUs are the limiting factor at higher resolutions.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.
