1.536vCore are you joking me!
what on earth is this person doing lol
i cant get 3.4 prime stable unless i use 1.55v in bios!!It depends what memory you are using MiNxYyY.
Now as you haven't listed any useful specs I will have to use my Force-Powers and read your mind, bear with me it takes some time. . . .

Hoping the 1.68 is a typo as that is extremely high!
1.168 idle and 1.136 load