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Analysts have speculated that AMD's lack of low-power designs at the time were behind the decision to go with Intel.
However, in 2011, Apple investigated using AMD’s low power Llano APU for the Mac Book Air, but eventually opted for Intel due to AMD's potential inability to supply enough Llano processors to meet demand.
Apple released Mac OS X v10.6 "Snow Leopard" on August 28, 2009 as Intel-only, removing support for the Power PC architecture.
Despite that, Snow Leopard does support Power PC based applications and was the final version of mac OS to do so.
It is not publicly known whether Apple maintains current builds for any other architectures although the related i OS runs on the i Phone's ARM architecture.The first was the switch from the Motorola 68000 ("68k") series architecture (used since the original Macintosh 128K) to the Power PC architecture.