Apple–Intel transition

Apple's Intel transition was the process of changing the central processing unit (CPU) of Macintosh computers from PowerPC processors to Intel x86 processors. The transition became public knowledge at the 2005 Worldwide Developers Conference (WWDC), when Apple's CEO Steve Jobs made the announcement that the company would make a transition from the use of PowerPC microprocessors supplied by Freescale (formerly Motorola) and IBM in its Macintosh computers, to processors designed and manufactured by Intel, a chief supplier for most of Apple's competitors.

The transition marked the Macintosh platform's second migration to a new CPU architecture. The first was the switch from the Motorola 68000 ("68k") series architecture (used since the original Macintosh 128K) to the PowerPC architecture. Apple is the only personal computer company to have successfully completed such a transition – competitors Commodore and Atari never regained their market positions after their switch from 6502 to 68k in the mid-1980s and stopped manufacturing computers in the early 1990s, around the time Apple was switching to PowerPC.

Apple's initial press release indicated the transition would begin by June 2006, and finish by the end of 2007, but it actually proceeded much more quickly. The first generation Intel-based Macintoshes were released in January 2006 with Mac OS X 10.4.4 Tiger, and Steve Jobs announced the last models to switch in August 2006, with the Mac Pro available immediately and with the Intel Xserve available by October 2006. The Xserve servers were available in December 2006.

...
Wikipedia