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http://www.cpu-world.com/CPUs/Bulldozer/AMD-Athlon%20X4%20880K.html , many thanks go to the comments of that link. I find some interested information on http://geizhals.de/amd-athlon-x4-880k-black-edition-ad880kxbjcsbx-a1391512.html .
Please take a look at the screenshot above, like so many other Black Edition processors, such as Athlon 7750 BE and so forth, the BE version has unlocked multiplier. In other words, you could overclock it much easier. I wish this could answer your question.
t Thank you very much for your answer.