Hell yeah it is. I'm thinking realistically the ability to do this is more than 50%... It has to be. AMD tests a few chip out of a batch, if too many of them have flaws then they disable the "flawed" cores in all the chips for that batch. It stands to reason that most x3 and x2 chips are worth buying for the purpose of unlocking.
If you get a bad one, YOU LOSE... HA!