Core i7 920 rev D0 stepping 5 :)

[jcniest5]

I've been pretty happy with my C stepping running @ 3.8Ghz stable on air. What kind of increase can I get with these D0 stepping chips? Am I better off just waiting for some higher clocked chips to come out?

A D0 will give you at least 4Ghz (my does 21x205 on a crappy mobo). But if you are happy with your C1, there is no reason to get a D0. People who get the D0 are the the absolute maniacst of the PC users. They want the absolute best every single time.

is the A and B differs anything?

I heard B's are better with C0/C1, is it same with D0's?

In general, yes. But I have read there are A batches that OC like crazy as well (IE: 3849A832). It's a certain batch (whether it's A or B) that are distinguishable among others...that can OC like crazy. It's not every A batch or every B batch, that's why it's so hit and miss. Sometimes you would get a B that would OC like crap. And the same for A batch. There is no garantee unless you can hand pick one that has already provened by someone else. And even that is not a garantee because every chip is different, even if it's the same batch # as what the other users have.