Hi, I have a new ibook 1.33GHz 12", (my first mac) and I love it. I'd like to upgrade the RAM and i've done some searching through the forum, and everyone keeps stressing that we need to buy RAM from somewhere like Crucial or DataMem, etc. This seems to be b/c the RAM needs to be very particular in order to work - i'm wondering what specs exactly the ibook looks for to see if it will work? From the crucial memory checker I found that I need: DDR PC2700 CL = 2.5 UNBUFFERED NON-ECC DDR333 2.5V 128Meg x 64 (for a 1GB stick) So what exactly is the critical value? The Cas-Latency (CL)? The error checking? (ECC) I'm just wondering if you get these specs somewhere else, will the memory be fine? Crucial's 1GB price is now close to $200, and Datamem is around $140. I've seen other places closer to $100. Thanks! edit: also, I've read some things about the new ibooks taking DDR333 PC2700, but it's actually only running at PC2100 b/c of the motherboard - is that correct?