PowerPC G4 microprocessor technical specifications

Families 7400 and 8400.

For the first time, it included the Altivec instruction set, or Velocity Engine as advertised by Apple. This was a set of floating-point and integer SIMD instructions.
It was used by Apple in its PowerBook, iBook, and Mac mini lines from late 2003 to late 2005, just before switching to Intel processors.