Amazon.com: parts-quick 512MB Memory RAM Upgrade for Apple iBook G4 Flat Panel 1GHz, 1.25GHz DDR PC2700 SODIMM Brand : Electronics
Youtube on an 867mhz titanium powerbook g4 with only 512mb of ram and a 4200rpm hard drive with Leopard Webkit. Still shows how powerful these old PPC's really are. : r/VintageApple
A-Tech for Apple 2GB Kit 2X 1GB PC2700 333MHz PowerBook G4 Mid 2005 M9689LL/A A1107 Memory RAM at Amazon.com
iBook G4 1.2 with 1.25g RAM and a 128g SSD. Currently testing Snow Leopard off a FireWire SSD : r/VintageApple
Global Memory 256MB DDR 333MHz PC2700 200-PIN SODIMM Memory Ram for iBook G4 & Aluminium Powerbook G4 at Amazon.com
How to upgrade RAM in your Apple iBook G4 - YouTube