In the second quarter , AMD planned to announce Phenom FX processor , which possess higher frequency in comparison with Phenom 9900 (2.6 GHz).
With the reference close to AMD sources , B3 stepping will not brought to Phenom processors improvements in the overclocking potential. The primary priority of this stepping is the elimination of TLB problem . The same source reports that improvements in the overclocking will come with B4 stepping , which will be released in April- May of the present year.
So the first processors Barcelona stepping B3 will fall in AMD hands even in this block.