CanadaRam and others, I need your expertise! I know that my Powerbook takes DDR PC2700 speed ram. but a few questions: 1. I've heard DDR memory is backwards compatible. does this mean I can put DDR PC3200 ram into my powerbook? 2. Looking on NewEgg.com I've noticed that some DDR PC2700 ram specifically say they're for Macs, while others don't. Is there any difference? 3. Is it at all worth it to shell out a few extra bucks for a Cas latency of 2 instead of 2.5? I'm not exactly a power user, I just like to leave everything open. EDIT: oh, and there's no problem with me mixing an apple 512MB stick with a 1GB stick is there?