The best replacement for am2 is 939.

The best alternatives to am2 are rated as following:
★★★★★  939
★★★★★  am3
★★★★  am2+
★★  core 2 duo
★★  fm2
★  socket 939
★  am2
★  775
★  am3 socket
★  am2+ socket
★  conroe
★  754
★  ax
★  anime expo
  939 socket
  fm1
  core 2
  am2 plus
  am2 socket
  lga775
  socket a
  socket 940
  940
  s939

Your alternative for am2 is not listed? Suggest!
Speaking about am2, one probably shouldn't forget about ddr3.

Other search terms related to am2 and their ratings are:
★★★★★ ddr3
★★ am3
★ am2+
★ am3 socket
phenom 2
You have in mind a companion for am2 and it is not yet here? Propose!



Google Trends

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am2
939
am3