E6550 @ 460x7 1:1 on IP35 and E6850 @ 400x9 4:5 on IP35 Pro. I did not have to raise vMCH in either case, all I needed were vcore and vdimm. This is not the max for either system so I am not sure what point I would need more volts to the MCH.
Actually raising the MCH seemed to cause instability for me.
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