The best replacement for ddr2 667 is ddr2 800.

The best alternatives to ddr2 667 are rated as following:
★★★★★  ddr2 800
★★★  800
★★★  533
★★  ddr2 533
★  ddr2 1066
★  ddr 400
  ddr2 553
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Speaking about ddr2 667, one probably shouldn't forget about 533.

Other search terms related to ddr2 667 and their ratings are:
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