FWIW my E6 is running 2.6 @ 1.5 right now burning in, very stable so far, hoping for lower vcore. I did have it stable at 2.75 using 1.6v but I was told this was too much for air even though my load temp was 44C. I didn't bother to push it higher then 2.75 after I read that. I have the same stepping as evetS-