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PC2-3200 memory uses the DDR2-400 memory standard. PC2-4200 memory uses the DDR2-533 memory standard. DDR2 memory is backwards compatible. That means that you should be able to buy any PC2-xxxx memory that is higher than the memory needed and it will work. I would check with the memory manufacturer to confirm this before spending the money. http://en.wikipedia.org/wiki/DDR2_SDRAM
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