The best replacement for 1866 is 2133.

The best alternatives to 1866 are rated as following:
★★★★★  2133
★★★★  1600
★★★★  1600 ddr3
★★★  1333
★★★  2133 ram
★★  1600 ram
★★  1873
★★  2400 ram
★  2400 ddr3
★  1333 ram
★  1600 memory
★  16gb 1600
★  1600 haswell
★  2133 ddr3
★  ddr3 1600
★  16gb 1333
★  1600mhz
  1600 apu
  ddr3 2133
  1600 benchmark
  1800
  32gb 1600
  ddr3 2400
  1333 ddr3
  1600 mhz

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1866
2133
1600