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Normal Voltage Ranges For C2D and Rampage II Formula

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Mar 31, 2014
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Grunn, Holland
System Name Indis the Fair
Processor i7 4790k Delid 4.7@1.28
Motherboard Asus Z97I-PLUS
Cooling Noctua NH-U14S
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Keyboard Corsair K70 (MX Blues, dying blue lights)
Software Win7 x64/Ubuntu
#1
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)