AMD will have three different revisions of Phenom processors. Both Agena Quad core and Coma Dual core will be affected with these revision changes.
B0 revision is also marked as 0648 after that comes B1 revision marked as 0714 and finally B2 should be the one and it is marked as 0723.
We don’t know the real differences between the revision but last time we checked B2 was suppose to be the life saving one that can be clocked faster and there are some indication that it operates with lower voltage. B2 is the one that can work at 3 GHz that is something we can confirm.