The best replacement for 1333mhz is 1066mhz.

The best alternatives to 1333mhz are rated as following:
★★★★★  1066mhz
★★★★  1866mhz
★★★  1600mhz memory
★★★  1600mhz
★★  2400mhz
★★  2133mhz
★★  1600mhz ram
★  1600mhz ddr3
★  16000mhz
★  4gb 1600mhz
★  2000mhz
  1666mhz
  16gb 1600mhz
  800mhz
  8gb 1600mhz
  6gb 1600mhz
  ddr3 1600mhz
  1067mhz
  ddr3 1066mhz

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

Other search terms related to 1333mhz and their ratings are:
★★★★★ 1600mhz
★★ 1600mhz ram
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1333mhz
1066mhz
1866mhz