The best replacement for am3+ is fm2.

The best alternatives to am3+ are rated as following:
★★★★★  fm2
★★★★  am3
★★★  lga 1155
★★★  fm2 socket
★★★  lga 1150
★★  am2+
★★  1150
★  1155
★  fm1
★  fx2
★  am3 socket
★  am3b
  am3 difference

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Speaking about am3+, one probably shouldn't forget about am3 motherboard.

Other search terms related to am3+ and their ratings are:
★★★★★ am3 motherboard
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