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The confusion around DDR2-533 (PC4200 vs PC4300) is simple: PC rating for DDR2 modules can be calculated by multiplying the clock by 8. That would result in PC4264 for DDR2-533 memory -- which could be rounded either down to PC4200 or up to PC4300. Even though labels from various manufacturer say one or the other, it's the exact same thing.
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