An AGP 8x X800 was released by ATI for the mac at $499 and looks like it will fit in a G4 bacuse its the size of a single AGP card. However, it does not support a G4 according to their site (more than likely this is the result of the x800 being incopatible with AGP speeds less than 8x). Even the PC version supports only 8x AGP or PCI-Express so to get this to be compatible on anything below a G5 will be impossible(?). :ohmy: