The best replacement for ddr2 800 is 667.

The best alternatives to ddr2 800 are rated as following:
★★★★★  667
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★★★★★  1066
★★★★  ddr2 667
★★★  ddr3 1333
★★★  ddr3 1600
★  ddr3 800
★  ddr 400
★  ddr2 533
★  533
★  ddr2 1200
★  ddr3 1066
  1200
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Speaking about ddr2 800, one probably shouldn't forget about ddr2 667.

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ddr2 800
667
ddr2 1066