The best replacement for 840 is 840 evo.

The best alternatives to 840 are rated as following:
★★★★★  840 evo
★★★★★  840 pro
★★★★  830
★★  m500
★★  850 bmw
★★  850
★★  vertex 4
★★  v300
★★  hyperx 3k
★★  crucial m4
★  530
★  sandisk extreme
★  520
★  intel 520
★  330
★  955
★  830 samsung
  intel 330
  940
  845
  intel 335
  945
  epson artisan 835
  lg 800g
  sandisk ultra plus
  jaguar xk8
  cosmos s
  852
  830 samsung ssd
  samsung 840 pro

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840
840 evo
840 pro