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Normal Voltage Ranges For C2D and Rampage II Formula

Mar 31, 2014
854 (0.57/day)
Grunn, Holland
System Name Indis the Fair
Processor i7 4790k Delid 4.7@1.28
Motherboard Asus Z97I-PLUS
Cooling Noctua NH-U14S
Memory Kingston HyperX 2x8GB 1866MHz C10
Video Card(s) Evga GTX 670 FTW
Storage MX100 256GB, WD Red 3TB, and other stuff
Display(s) BenQ XL2430T, LG 24 inch LED IPS thing
Case Phanteks Enthoo Pro M
Audio Device(s) Behringer Xenyx Q1002USB, ATH-M50x
Power Supply Seasonic 860w Platinum
Mouse Logitech G502
Keyboard Corsair K70 (MX Blues, dying blue lights)
Software Win7 x64/Ubuntu
So I recently acquired a Rampage II Formula for around 100 bucks, I threw my old E7200 in to see how far it would go, but it doesn't seem to be as simple as changing multis and the Vcore like Haswell is.

Main question I have, is what are the normal voltage ranges for this board and CPU. I am currently running at ~1.4V on the core with 422FSBx9.5 so the CPU is just over 4GHz. But it doesn't seem to be stable in P95, although I have ran a couple of superpi 1M runs and it works fine (13ish sec)