Hey everyone! I apologize if this has already been asked... I searched the fourms, but didn't see anything. I have a 2.0GHz CD Macbook, with 1GB of ram (x2 512 sticks). I'm looking to upgrade to 2GB+. Here's the question: I know that having two sticks work better than one of the same value (eg 2x1GB vs just 1 2GB). Would it be better to buy 2 1GB sticks for a total of 2GBs? or buy 1 2GB stick, and use one of my 512s to give me 2.5 total? Thanks in advance!