Currently Being ModeratedMar 5, 2013 6:31 PM (in response to AShawLikeFrito)
6gb is the max and you need the following type of ram:
200-pin PC2-5300 (667MHz) DDR2 SO-DIMM. Apple tested it with 4gb, since then 6gb has been proven to work as tested by many 3rd parties. Apple does not go back and test so they can't say 6gb is the max, but it is.