Firstly you need to see how many cards are making up your 1 gig. Sometimes you get 2 512's in there. Go to apple, about this mac, more info and look under memory this will tell you how many slots are being used. If you've got room the RAM will just go in the empty slot. If not you can swap a 512 for a 1 gig card and have 1.5 gig and either sell the other one or keep it.
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