It is impossible to reach 4.25ghz stable with 1.33v Vcore when you use 1.28v for 4.1ghz. Try to up your vcore more.
The vdrop is kinda bad, under load CPU-Z only reports 1.248v and thats with LLC enabled. With the 2nd template I had posted, that results in CPU-Z reading 1.312v under load. So that's a .06v increase going from 4100 to 4250.
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