Quote Originally Posted by OC Nub View Post
My first chip clocks great with low voltage, but it wont boot at 5200mhz no matter what. I think it was raja@asus that posted about the chips that do 2600+ mem are also the highest clocking chips.

The chip im using now needs higher voltage clock for clock than the first chip, but it will boot at 5400mhz (not benchable on water) and is benchable up to 5250-5300mhz. It is also much better for higher memory frequency.
My findings are similar. My more voltage hungry 3960x actually clocked higher than my lower voltage chips. In any event, it does seem that the limits on these chips are firm unless your go sub ambient. I've had 4 chips so far and only one does 24/7 reliably at 5.1ghz. All of them are benchable at between 4.9 and 5.2, but 3 of them hit the wall firmly at 4.9 to 5ghz with water cooling for daily use. Base clock, strap, and multiplier combos didn't matter much.