The best replacement for core duo is core 2 duo.

The best alternatives to core duo are rated as following:
★★★★★  core 2 duo
★★★★  dual core
★★  i3
★  pentium 4
★  i7
★  pentium d
★  intel core 2 duo
★  pentium m
★  i5
★  turion
★  pentium
★  core i5
★  quad core
★  core 2
  celeron
  pentium dual core
  centrino duo
  core quad
  core solo
  centrino
  atom
  core duo 2
  amd turion
  core2duo
  intel core i5
  intel dual core
  intel i3
  duo core
  intel i7
  core i3
  centrino 2
  core i7

Your alternative for core duo is not listed? Suggest!
Speaking about core duo, one probably shouldn't forget about turion.

Other search terms related to core duo and their ratings are:
★★★★★ turion
★★★★ core 2 duo
You have in mind a companion for core duo and it is not yet here? Propose!



Google Trends

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core duo
core 2 duo
dual core