Okay...I solved it...it was the biggest facepalm ever.
For some reason the Nvidia Experience set the resolution to 1366x768 144Hz...and I got 60Hz screen.
Then I've just realized that for some reason in the BIOS the Advanced Clock Calibration was disabled. So with enabling that (getting a quad core instead of a dual) and setting the proper resolution I get 80-120 FPS while playing on Ultra settings...
Thanks to all of you who were that kind and tried to help me I really appreciate it. Have a nice day!