Good grief! 1.25 GB of RAM in my old 1GHz 12" PowerBook used to be enough for me, but now with my MacBook with 1GB of RAM, I have around 90,000 page-outs after an uptime of only 1 day and 2 hours. Every time I start up iPhoto, it's ok, but once I try editing my first photo after opening the application, I get an extra 10,000 pageouts. I realize it's because I'm short on RAM, but can I be incredibly short on RAM when 1.25GB used to be enough? Is it because this computer has 2 cores and requires a bit more RAM for both cores to use? Also, has anybody read any reviews of the MacBook with regards to the "performance hit" I might suffer from not using two matching sticks of RAM? I have 2x 512MB sticks of RAM, but can't afford 2 x 1GB sticks. I might just buy a single stick for now, but not if getting more RAM means performance actually gets worse.