at first boot this ram defaulted to pc2-5300 or 667MHz. my elpida booted at pc2-6400 or 800MHz. at default voltage of 2.1v and timings of 6-6-6-18 i had it boot to windows at 1260MHz but haven't had the luck to get it running stable at this clock. these are running on my dfi lanparty p35 with a e6300 @ 3360MHz and a ram at a pretty 1203MHz with 5-5-5-18 and 2.1v. i first thought that i got jipped after buying this ram because people say these had micron D9s and others say they never did. but if you really think about it (1260 - 667 = 593MHz). which is one hell of an overclock. ladies and gentleman a new world record.