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well i dont remember where i read it but 3,1-5,1 can take up to 6gb of ram one 2gb and one 4gb can someone confirm. but no the ram you need is here what you were looking at was desktop ram you need sodimm ddr2 for laptops.

update

here is the article i read about the macbooks being about to use 6gb of ram. but that may cost a little much.
 
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