Played around with VTT yesterday but i do not get it completly.
To my understanding Vgtl-Ref (vtt/fsb term Voltage x GTL multiplier (0.62-0.67)) needs to be in relation to Vcore.
To find the sweet spot i did the following.
dropped down Vcore some notches, to get the cpu slightly instable, and then testing throug each mulitplier at a given VTT and the repeat that with the next value for VTT.
This should give me an idea what vGTL-ref is a good one for this certain vcore.
After i would have found a goof vtt, gtl setting i thougt on raising the Vcore back to the known stable voltage and because of that I would have to raise VGTL-Ref too
My problem is, how much should i raise Vgtl ref or better how should I ? By raising the GTL multiplier or by raising VTT.
Maybe itīs complete BS what Iīm thinking of, then just tell me.

Last known stable setting (Prime large, small, Blend each 3h and intelBurn test maximum 10 rund)
Rampage Foormula, 803 or 802 bios
420x9.5,
Strap 333,
Vcore 1.45 Bios (load 1.36)
LLC Disabled,
VTT 1.36 Bios, 1.26/1.28 according to everrest,
VNB 1.47,
SB,SB1.5,CPU PLL on Stock settings set manually.