The best replacement for powerpc is intel.

The best alternatives to powerpc are rated as following:
★★★★★  intel
★★★★  x86
★★★  arm
★★★  intel mac
★★  mips
★  intel processor
★  microblaze
★  intel processors
★  intel based mac
  intel imac
  i386
  sparc

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Speaking about powerpc, one probably shouldn't forget about snow leopard.

Other search terms related to powerpc and their ratings are:
★★★★★ snow leopard
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powerpc
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