how many designs re there for the computer that runs on the RISC-based PowerPC G4 processor, designed by the AIM development alliance and initially produced by Motorola, and preceded by the first laptop to use the PowerPC G3 ?
PowerBook G3:  It was the first laptop to use the PowerPC G3 (PPC740/750) series of microprocessors, and was marketed as the fastest laptop in the world for its entire production run. PowerBook G4:  The PowerBook G4 has two different designs: one enclosed in a titanium body with a translucent black keyboard and a 15-inch screen; and another in an aluminum body with an aluminum-colored keyboard, in 12-inch, 15-inch, and 17-inch sizes.
two different designs