@ platojones - I had exactly the same thing occurring with my P5Q-Deluxe. It was like a fast pulse of low power, fans would drop rpm slightly, it would happen and return to normal in about half a second. It seemed to be a 'feature' of my board, as I tried bumping up voltages thinking it was almost failing POST (although it was totally stable using Orthos, Linpack, memtest and gaming), but it did not alleviate the issue. I think yours may have been more pronounced, and by upping the vdimm you got it to where mine was; slightly present.
The thing is, my Maximus II Formula does not do it, even when using less vdimm that I was on the deluxe, and the same vcore, vFSB, vNB and vSB.
What vFSB & vNB are you using on your board?
One thing you could try - raise the vFSB a little. Try to keep the maximum vdiff between the vFSB and vNB less than 0.12v, such that the vNB is no more than 0.12v higher than your vFSB.
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