I have just finished up my review of the Athlon 64 FX-62 processor, the first CPU to offer the AM2 processor socket and DDR2 memory for the AMD platform.
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The performance delta between the AM2 and S939 parts of matching frequency and cache sizes is nearly indistinguishable in my testing. The move from DDR to DDR2 memory speeds was never going to bring massive of amounts of performance change, though had AMD gone into DDR2 any earlier, we probably would have seen performance decreases instead of increases. An X2 4800+ processor based on the AM2 platform with DDR2 memory is going to perform only a percent or so faster than an X2 4800+ based on the 939-pin platform with low latency, standard DDR memory.