You have a nvidia gtx970, therefore I'm going to assume you are running GeForce Experience also. You'll need to check the settings on that per game because GE will maximize performance of the gpu, which isn't always a good thing as you'll get limited fps due to the cpu. It's not uncommon for GE to try and drop a 4k DSR instead of a 1920x1080 (1080p) in optimized settings, which gives a great picture, at the expense of massive fps loss if your cpu is lackluster. Because these settings are gpu bound, they are considerably more intense than most games have as default, so by dropping the games actual settings, the ones not changed are set by GE, at optimized for the gpu.
In a nutshell, the gpu is demanding more than the cpu can give, so you'll see considerably lower fps.
GE isn't necessary at all, can be disabled or removed, the only thing needed is the gtx drivers which you can dl yourself.