ok I played Overwatch now, and my fps is 200minimum, around 100-200 fps boost wtf O.O.
To conclude, My OC is stable I guess (as I said, ran Linkpack for 1 hour with no issues found, and ran Prime95 for 6-7 Hours all cores success, max cpu temp - 70).
So just not to be worried, it looks like it's stable and all good right?
gonna test more games now but so far huge thanks for staying and helping me for so long