Dear Pamela, Yes, PC133 is definitely faster, later technology. A good place to start to see if there is some compatibility is this little program called Mactracker. A must for Mac enthusiast who want to know about their machine. Go here: http://www.mactracker.ca/ It appears from the information that you have given that your memory ID in your key lime iBook is PC66. This is perhaps the last of the clamshell model ibooks? So believe you can purchase the PC100, you won't get the full speed benefit, as you are limited by the 66 however no need to spend extra on the PC133. Hope this helps a little, just wanted to contribute to this excellent and informative list for iBook users. Lachlan. Switcher as of November 2003. On 18/12/2003, at 9:51 AM, Pamela Plowman wrote: > What's the difference between PC100 SDRAM and PC133 SDRAM? I thought I > heard somewhere that PC133 is faster so that is what I am thinking I > want to get but I don't know if it will work with my Key Lime iBook > (it's 466MHz and I am upgrading it to 576 MB RAM, but I need to know > which module to get). > > Any help would be appreciated! > > Thanks, > Pamela > > > ---------- > iBookList, a listserv for users and fans of Apple's iBook. > FAQ at <http://www.themacintoshguy.com/lists/iBookListFAQ.shtml> > > To unsubscribe, E-mail to: <ibook-off at lists.themacintoshguy.com> > To switch to the DIGEST mode, E-mail to > <ibook-digest at lists.themacintoshguy.com> > Need help from a real person? Try. > <ibook-request at lists.themacintoshguy.com> > ---------- > Small Dog Electronics http://www.smalldog.com | Enter To Win A | > -- Canon Digital Camcorders start at $799 | Free iBook! | > > iBookPlanet.com | Visit iBookPlanet.com for the hottest > | iBook News, Features, Reviews & More. > > RoadTools $30 PodiumPad available at Apple retail stores, $20 > Traveler > CoolPad at Staples. Both in white for iBooks at > <http://roadtools.com> > > MacResQ Specials: LaCie SCSI CDR From $99! PowerBook 3400/200 Only > $879! > Norton AntiVirus 6 Only $19! We Stock PARTS! <http://www.macresq.com> > >