The best replacement for dual core is quad core.

The best alternatives to dual core are rated as following:
★★★★★  quad core
★★★★★  core 2 duo
★★★  single core
★★  i3
★★  quad core processor
★  i5
★  core duo
★  dual processor
★  pentium 4
★  quad core tablet
★  quad core macbook pro
★  intel dual core
★  hyperthreading
★  core 2
★  quad core gaming
★  single core processor
★  quad
  quad core phone
  quad core macbook
  single
  quad core processors
  i7
  amd
  ht
  intel core
  hyper threading
  triple core
  core2duo
  pentium
  single core processors
  quad core phones
  i3 processor
  duo core
  celeron
  quad core smartphone
  i3 which is better
  intel
  quad core is best
  centrino

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

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



Google Trends

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dual core
quad core
core 2 duo