Hey guys, at the time I bought my macbook pro (1.83ghz with 512 ram) I opted not to upgrade the ram at the apple store, too much money for the amount I thought. So now Ive heard that mbp run best when the ram is paired. So which do you think would yield the best performance? Getting another 512 stick or getting a 1 gig stick? The nice part about getting a 1 gig stick would be that if I wanted to upgrade to 2 gigs It would be easier, but I heard you need to have at least 1 stick of apple ram in the laptop to not void warrenty, is this true?