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Intel places the memory controller on the northbridge chipset, while AMD places it in the CPU. This means that upgrading from DDR to DDR2 means you must buy a new CPU, Mobo and RAM for the AMD while on the intel only needing a new CPU and RAM. This is, however, not a major concern for most people. Having the memory controller on the CPU does allow the CPU and RAM to communicate directly, not having to pass through the northbridge chipset, this brings certain advantages as outlined in the informative posts by n0nsensical above.
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