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The G4 is a powerful RISC-based microprocessor made by AIM (Apple Computer, IBM and Motorola). The G4 also contains AltiVec (a.k.a. Velocity Engine), a 128-bit vector processing chip.

Also called the 7400, the G4 was introduced in the fall of 1999 at speeds ranging from 400 to 500 MHz. The chip contained 10.5 million transistors and was manufactured using Motorola's 0.20 μm HiPerMOS6 process. The chip die measured 83 mm2 and featured copper interconnects.