The best replacement for ddr3 1600 is 1333.

The best alternatives to ddr3 1600 are rated as following:
★★★★★  1333
★★★★★  1866
★★★  2133
★★  2400
★★  ddr3 1333
★★  1066
★★  ddr3 2000
★  ddr3 1866
  ddr3 2400
  ddr3 2133

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Speaking about ddr3 1600, one probably shouldn't forget about 1333.

Other search terms related to ddr3 1600 and their ratings are:
★★★★★ 1333
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ddr3 1600
1333
1866