The best replacement for 1333 is 1600.

The best alternatives to 1333 are rated as following:
★★★★★  1600
★★★★  1866
★★★★  1066
★★★★  1600 memory
★★  1600 mhz ram
★★  1600 mhz
★★  2133
★★  1066 ram
★  1600 ddr3 ram
★  1600 ddr3
★  1666 ram
★  2400
★  ddr3 1600
★  1600 ram
★  1866 ram
  1600 ivy bridge
  8gb 1600
  2133 ram
  ddr 1600
  1066 memory
  1066 ddr3
  10600
  4gb 1600
  1066 mhz
  1066 macbook pro
  1066 fsb
  1067
  ddr2 800
  ddr3 1066
  fsb 1066

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

Other search terms related to 1333 and their ratings are:
★★★★★ 1600 ram
★★★ 1066
★★ 1600
★ ddr3 1600
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Google Trends

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1333
1600
1866