The best replacement for ddr3 ram is ddr2.

The best alternatives to ddr3 ram are rated as following:
★★★★★  ddr2
★★  ddr3 sdram
★★  gddr5
★★  ddr2 ram
★  ddr3l
★  sdram
★  ddr4
  ddr1
  dimm

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Speaking about ddr3 ram, one probably shouldn't forget about ddr2.

Other search terms related to ddr3 ram and their ratings are:
★★★★★ ddr2
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