All the fuss and risk everyone is gnashing their teeth over isn't really warranted when it comes to the Q9550. From what I've read, the stepping doesn't make as big a difference on the Q9550 as it did on the Q6600 when it comes to O/Cing. I've got a C1 stepping Q9550 and it's been humming along nicely at 3.825Ghz in my box without any issues. A E0 stepping isn't going to gaurantee a better overclock - it really just depends on the CPU you get.