stutter

Guys, I need an explanation, please. I have RTX 2060 graphics card, Ryzen 7 2700X CPU, 16GB of RAM and 1TB HDD, but and I still cannot run my games at "a high" level, for example, nearly all of my GTA 5 settings need to be set to low in order for me to get target fps (75 fps), and on Call of...