Hello, I have a 700mhz iBook with 384mb RAM and the combo drive. I believe the combo reads CDs at 24x. I am currently ripping CDs to 128kbps AAC at 5.5x. Just wondering if maxing out my RAM to 640mb will increase the AAC encoding at all? Or are the bottlenecks more in reading from the CD and then the 700mhz processor? Any tips on how to improve AAC encoding in iTunes. It is pretty good now but I'm just looking for another reason to spend the $ on RAM! Thanks.