Earthdog said:I am starting this thread so I can take some off topic posts out of another and get to the bottom of these questions. There are a couple of links below we found to help us answer it, but it still isn't certain.
The questions are:
What EXACTLY does VRM Spread Spectrum do? Does it change frequency or the actual voltage for additional stability and EMI reduction?
Is this a Haswell/Haswell-E feature due to the FIVR? I have only seen it on Z97 and X99 in my quick google searches...
Because of the chronology of these posts, wingman's is first... see above for 'back' information....
When you 'disable' spread spectrum it only affects the BCLK (that we can see)... It does not tighten up voltage tolerances that I have seen. Its about the clockgen and signal integrity/EMI prevention.
Really, these are, to me, typical voltage fluctuations and nothing to worry about.
My sandy-bridge vcore voltage was rock solid with the GA Z68 board. With my new GA Z170 HD3 I think they use spread spectrum on VRM voltage because it varies and you can't disable it.
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