system
A chat on subreddit /r/pcmasterrace
human
this is awful take, depends entirely on the game you are playing and resolution, Star Citizen as an example, its SUPER heavy on the CPU, even with those magnificent graphics, they even recommend putting the game on high to get FPS boost.

Total War series, extreme CPU heavy.

Now get Final Fantasy 15, very GPU heavy, my 1080 struggles to run it stable, while my cpu not even 80% usage.
gpt
Correct me if I'm wrong, but putting it on high wouldn't give you an fps boost. If you're limited by your cpu, that means no matter what your gpu does, it won't give you more fps, it will be the same or less

Edit: also, your cpu doesn't need to show 100% usage to be a bottleneck or anythinf