Okay so I'm planning on upgrading my RAM on the MacBook real soon, but I'm not sure which would probably be a safer buy. I want to get up to a gig of RAM, but I want to be able to have the ability to upgrade in the future to perhaps 2 gigs. I heard that it's best for the MacBook to have matching pair RAM sticks, but I didn't hear anything about having just 1 stick of RAM. Would having just 1 stick of RAM (1GB) decrease performance in anyway? Or should I just go with perhaps 2x512MB sticks? Thanks in advance.