so i am on ocw site and looking for a 512 mb ram upgrade for my 1ghz ibook. Can someone tell me which chip is the one for me.. one is 333mhz and the other is 266mhz.. 1. 512MB PC2700 DDR 333MHz CL 2.5 200 Pin Low-Profile (non-stacked!) Memory module for All PowerBook G4 17" & 12" Models; Apple PowerBook G4 (15-Inch FW800 1GHz-1.5GHz), iMac G4 1GHz-1.25GHz, iBook G4 Models. New, Lifetime Advance Replacement Warranty. (OWC2700DDRS512A) more info... $97.99 2. 512MB PC2100 DDR 266MHz 200 Pin Low-Profile(non-stacked!) Memory Upgrade Module for Apple iMac G4/1GHz 17" model, PowerBook G4 12" 867MHz - 1GHz Models, all iBook G4 Models. New, Lifetime Advance Replacement Warranty. (OWC2100DDRSO512) more info... $96.95 thanks.