I should have find a solution to my issues.
I have found out 2 problems:
To solve the first one I followed these steps:
With this procedure I solved the crashed that occured suddenly after some seconds that I played a game, but I found out that after 5-10 minutes of playing the system crashed anyway.
I played with frequency and voltage and the results of my investigation is that the frequency-voltage-PL setted by ASUS as default are not stable. Now I'm stable with 2034 MHz, 1,14 V (the voltage that Adrenalin set automaticaly basing on the curve freq-volt), PL +20% and to be sure of it I benched for 3 hours with CS:GO. I know that could seem strange to test with a "light" game as CS:GO, but this game (as well Dragon Ball:Kakaroth) pointed out my instability, while with the same parameters I was able to pass 2 hours of stress testing with Superposition and 3D Mark or one hour of playing with Battlfield V.
I hope my post will help you.