you wrote... I am taking the plunge and have decided to upgrade my 500Mhz iBook to the full 640MB of RAM. I currently have 256MB. Thus, I am looking for a 512MB chip. Any recommendations for high value/competitive cost vendors? My local Apple dealer can get one for $129, but I thought they were going for under a $100 these days? i just got the cheapest i could find. go to macsurfer.com and you will find links. you will notice a vasit improvement! i have had 600 and now 700 dual usb ibooks and had 2 different brands, i think one was 133. anyway, i just got my 512mb for 115 dollars, i think from memory to go. you can probably do better than this, though. good luck, hurry, you won't believe the difference.