lol you post the same question in multiple forums 😛
I'm tellin ya, stepping is far more important than week. CCBBE are just like CCB1E, your standard dual core coldugged stepping that consistently hit 2.8 - 3 Ghz. And of course more on watercooling and even more with IHS removed.
Basically all Opterons that coldbug (CCBBE, CCB1E, CCB2E [fx60]) overclock pretty good, 2.8 to 3 Ghz. There are SOME trends, like from what i've seen, 0608s are the best, while 0610 and 0550 are pretty equal. But the gap there is pretty small, i mean CCB1E 0608 vs. CCBBE 0610 there's a very small gap. Compare it to a non-bugged stepping like CCBWE and you'll find something more like a 170 Mhz gap.
I would take ANY CCBBE over ANY CCBWE, probability wise that's the best. Unless you're trying to run on phase...