MacKiev 10579 World Book Encyclopedia 2008 - Macintosh System Requirements - Mac OS X 10.3.9 Panther or later including 10.5 Leopard, G3 350MHz (iBook and PowerBook G3 - 500MHz) including all Intel-based Macs, 256 MB RAM, 1024x768 Display, 8 MB VRAM Video Memory, 1.2 GB Free Space, DVD-ROM drive, and Internet connection required for accessing online features