Anything over 1.36v and you run the risk of degrading your CPU, the first one
I got did the same thing, I started off under 1.36v and 3.9ghz all was good
then I got the itch to go higher, and went with 1.41 to get to 4.0ghz all seemed well 6 hours prime stable then left it on over night ran prime the next day and Wham-O!! Not prime stable anymore not even 10 minutes

.
So I thought ok I'll just go back to the 3.9ghz and keep it under 1.36v again.
Wrong!!! Now the very best I could do was 3780mhz at 1.36v. So there
you have it.
Also I must add there were few times I had the vcore up to 1.44v (<10mins)
but never >1.45v.
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