I tried reading the guide about it and I'm still super confused! I have a white macbook from November 2007. It has a 2.2GHz processor and already has 2GB of RAM in on 2 separate 1GB DDR2 SDRAM cards (whatever those are...I just read it off system profiler!) I want to upgrade to 4GB if it's possible? Don't want to frazzle it to death or anything like that. The graphics card is the GMA X3100 if that makes any difference?! Any help would be wonderful!