On Saturday, June 14, 2003, at 06:48 PM, Randy Spencer wrote: > I keep seeing these come across my screen when I do a search for the > 450 > or 500 Mhz cards that I heard work on the Cube. The 800 Mhz cards do > not, is that true? Yes... "Can be used to upgrade a Power Macintosh G4 QuickSilver 733, 800, 867 & 933 Mhz single processor" Notice that those all 133 MHz multipliers - they are meant for 133 MHz system bus, and cube is 100 MHz. Maybe with some tinkering with jupers/resistors you might get it to work, but for that price it is not worth the effort.