Definitely not 1.4V. Stock vCore is ~1.35, and 4Ghz takes ~1.55V (Currently sxs112 has it at 1.575).
I'm wagering ~1.6, on the far end.
However, if 1.4V was the last "safe" threshold of Intel 45nm Penryn chips, the Phen-IIs should at least get to 1.6-1.7V safely (this is by percentage to stock load vCore, since both are presumed to use majority domino logic).
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