The best replacement for p4 is celeron.

The best alternatives to p4 are rated as following:
★★★★★  celeron
★★  amd
★★  centrino
★★  p5
★  pentium d
★  athlon 64
★  pd
★  athlon
★  celeron d
★  atom
★  p4g
★  xeon
★  a5+
★  p6 acca
★  p7 acca
★  p5 acca
  pm
  core 2
  p6
  pentium m
  core duo
  p3
  p6 pirelli
  core2duo
  hankook 727
  p4 ht
  amd 64
  allview p5
  athlon xp
  sempron

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Google Trends

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