Got some good news and bad news! Good news are that the problem was on my thermal paste on top of the CPU & Graphics card. So it was old, and my computer used to be extremely hot and sometimes it overheated so i changed it for a new thermal paste and i got 20 fps more! And my Cpu runs ok at normal speeds. The computer doesn't overheat anymore and I don't know if it's possible to get 20 FPS MORE by changing the thermal paste, but it's true!
Bad news are that I cant change my Graphics card because it is attached to the motherboard, can only change my CPU.
Thanks Tomshardware for trying to help me! And Merry Christmas!