The initial CPUs use B2 stepping, but an AMD BIOS and kernel document already shows reference to unreleased B3 stepping. A stepping update should bring improvements (usually minor) to performance and power consumption, as well as possible bug fixes. Stepping updates are a normal way to provide small upgrades in between bigger ones, such as die shrinks and microarchitecture changes. While B3 stepping may help Bulldozer a little bit, it's very unlikely that a stepping update would provide huge benefits and thus make Bulldozer significantly better than Intel's equivalent CPUs - so waiting for this update is not exactly a good idea.
AMD Bulldozer B3 stepping in the works
Posted on Wednesday, October 26 2011 @ 20:02 CEST by Thomas De Maesschalck