Check this out, and this.
Key is high PCI-E freq and high IOH Core V.
Some will say it isn't, but I say it is.I run my at 1.4375V QPI LLC Enabled.
You could say CPU PLL needs to be on sweet spot and I would agree. I use 1.35V for 980X, but for 970 I was using 1.2V. No way of finding it, but trial and error.
BTW, don't drop everything to lowest possible, just use known stable settings, and try to avoid lowest UnCore multi, very unstable for me.
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