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In May 2010, the AMD Phenom II X2 B57, a two-core desktop processor, was released. It is a member of the Phenom II X2 series, which uses Socket AM3 and the Callisto architecture. Phenom II X2 B57 runs at 3.2 GHz and has 6 MB of L3 cache. AMD used a 45 nm manufacturing technology and 758 million transistors to create the Phenom II X2 B57.