What HT speed were you trying to boot at? Mine will only boot with those timings below about 220 regardless of voltage. Beyond that I have to start loosening memory timings. 2.5-3-2-5 gets me up to about 235, 2.5-3-3-5 gets me up to 265ish, beyond that I've only tested 3-3-3-5 to be memtest stable at 270(DDR540) all these are at 1T. Doesn't seem like voltage makes much difference at all with these sticks, at least voltage under 2.85v.