I have an iBook 500MHz, with the old 8MB ATi Rage graphics card, theoretically incompatible with Quartz Extreme. I was digging through System/Library to try and find out how Quartz Extreme works. I came across a Configurations.plist file with some impossibly long path... /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/Configuration.plist with some interesting info... It looks like the VRAM controls for QE? If I'm reading it right, then changing the <key>GLCompositorMinimumVRAM</key> and <integer>16</integer> lines to have the same first line, but make the integer 8, should enable QE on my iBook! Does anyone know if I'm right or just deluding myself? If no one knows, I'll try it out, and report back, but I'd rather not risk my system if I know it won't work. Thanks!