I'm going to be boosting my RAM in my G5 from 2gigs to 4gigs. I have 4x 512mb modules right now which leaves me 4 slots open. Is there any advantage to getting 2x 1gig sticks vs 4 more 512 ones? Other than having 2 open slots and the 512 sticks being cheaper of course. I mean is there any technical advantage of using less but larger modules? I don't plan on going beyond 4gigs total with this machine. Thanks.