A customer, who decides today for a AMD system, seizes reasonably to a Athlon 64 system. But which take? Refrained from the many variants in things once there are Cache, Stepping and manufacturing processes for the Athlon of 64 two different bases: the base 754 with single Channel memory interface and the base 939 with dual Channel memory interface. Many customers ask themselves therefore, to which base they are to seize. The base 754 is cheaper and it gives more processors for it, the Main boards and processors for the base 939 is more expensive, but faster and probably more future surely.