It turns out that all this memory Voltage limitation of the X58/Core i7 platform might have more to do with board design than anything else, as there are work-arounds that solves the problem. Sources we've talked to is suggesting that as much as 2.3V is possible, although this could potentially damage the DDR3 memory.
It seems like it's possible to "trick" the motherboard into delivering more power to the memory than what Intel specifies and there will be several motherboard manufacturers supporting this feature, although there will be those that will stick with the Intel spec as well, as this is the easy way out.
We're not entirely sure how this work-around is done at the moment, but as long as it works, we're sure all the overclockers out there will be happy. This might also allow for higher memory speeds and we've heard numbers in the 2GHz range being mentioned on some X58 boards, although we have to wait a bit longer to see which boards will be the X58 oveclocking kings.
For now, the good news is that it's possible, the bad news is that we don't know which boards will support the additional Voltage and higher clock speeds, but it seems like the Asus P6T Deluxe might be one of those that don't do either, at least if the early details of this board is anything to go by.