Sounds like you understand DDR just fine. The reason that mobo manufacturers adverstise 800Mhz is because of a dual channel set up. Basically, with a dual channel Mobo and 2 identical sticks of DDR (stuck in the correct banks) each is accessed on a different bus, rather than one memory bus accessing both sticks. Thus, 800 Mhz. So bascially you get a transmission on the leading and trailing end of a cycle on a 200FSB = 400 Fsb x two channels = 800Fsb. I think it is somewhat of a hpye. Dual channel makes a diff on Intel, but very little of AMD IMO. In either case, it is definitely a let down from what I perceived dual channel with 800Mhz to be in terms of performance.
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