i know that the 7700k can be overclocked,but in my opinion it is exageration. It has a 4.2 GHz base and 4.5 boost. The CPU is already powerful at stock clocks (and overclock gives you the risk to fry the CPU and get higher temperatures)
you are right here. some games have heavy drops and i can confirm due to my personal experience, GTA5.but that is the minimum they run.on average you run with higher FPS.