It is the first operating system that has open-source BSD to be certified as fully UNIX cooperative.. This version is preceded by Mac OS X 10 4 Tiger and succeeded by Mac OS X snow leopard. powerpc powerpcb powerpc g5 5 for powerbookG4 Mac OS X 10 5 Leopard installation system requirements Processor: 700 MHz native PowerPC G3, G4, or G5 processor Operating system: Mac OS X Version 10.. 2 8; Mac ..