I have a G3 Powerbook that needs another stick of RAM. The original 256 added when new does not stand up to Panther. I have 2 sticks that I removed from one of my G4 Powerbooks. The G3 uses PC100 RAM. The spares that I have are PC133. Can it be substituted and what are the expected results if it can. Both are SO-DIMMs. Thanks for anyone help. -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ .