Very good info
One point I will comment on:
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DDR2 memory is better than DDR: False. Its just a different type of memory really. Similar to the difference between the Athlon and P4, DDR obtains its performance from efficiency and DDR2 from high frequency. In fact its arguable that DDR is superior, see this thread Gaaras Bandwidth Comparison
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I am not going to argue that DDR2 is "better," but I think the augment here is somewhat misleading.
Within the thread you linked too, all comparisons are DDR on A64 vs DDR2 on Intel. In that comparison, the bigger factor is IMC vs chipset MC. When comparing DDR on 939 vs DDR2 on AM2, DDR2 does add a significant amount of bandwidth. Now, this does not translate into significant performance increases for AM2 systems, primarily because 939 systems weren't bandwidth starved to begin width.
Great thread though, should answer a lot of people's questions.
