The best replacement for x40 is x41.

The best alternatives to x40 are rated as following:
★★★★★  x41
★★★★  x60
★★★★  h80i
★★★  goliath
★★★  h100i
★★  penomet
★★  h90
★  x31
★  x30
★  spice m9000
★  x41 thinkpad
  700m
  corsair h80i
  t42
  corsair h90
  x41 ibm

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x40
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