Ah, thank you for the elaborate answer.
Just one more if you wouldn't mind please then:
As soon as Afterburner is closed, the curve is gone? What to do to keep it permanent and reset it to stock if I feel like it?
Followed the guide in the OP and having ran Time Spy without any artifacts I scored lower than my "vanilla" run I had done a week ago.
Then I got rid of all unnecessary programs sitting at system tray and re-ran the test to see I broke the record for "AMD Ryzen 3 2200G + RTX 3080"...