We will probably not surprise you if we say that Barcelona and the rest of the K10 generation have really bad yields.
Barcelona doesn't have an overheating problems but it does have some bugs that will be fixed in the next revision of the core.
B0 core allows great clock speeds but it still has some major bugs inside and Barcelona won't see a market before the new revision of the Core and we heard our sources mentioning B1 as the potential revision name.
So that is why AMD will push Barcelona from Q3 to Q4.
Published in Processors
Barcelona, K10 has terrible yields
B0 yields bad