The reason for lowering CPU PLL is to not increase vCore. The best is to keep them both low.
I'm testing right now, but it looks to me my CPU "likes" 1.35V CPU PLL the most at 4.5GHz.
But no matter where you set CPU PLL sometimes you just need to increase vCore to stabilize CPU.
Should not be dangerous. I ran my 970 at 1.2V CPU PLL for 2 month and it's fine. If someone did it for longer, should advise.
Replied to you at the other forum.![]()
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