The best replacement for x4 is x6.

The best alternatives to x4 are rated as following:
★★★★★  x6
★★★  x16
★★★  x8 memory
★★★  x3
★★★  sizegenetics
★★★  x8
★★  g110
★★  macan
★★  mastercam
★★  phenom x4
★★  phenom ii x4
★  intel i7
★  i7
★  dl4
★  prophet 08
★  agp x8
★  core i7
★  shimano alivio
★  x2
★  alivio
★  ladybird
★  miele s7
★  core 2 quad
★  c3
★  intel quad core
★  x4
  syma x1
  x16)
  intel i5
  pcie x16
  logitech g110
  intel core i7
  phenom x2
  athlon x2
  size genetics
  athlon ii x4
  phenom 2 x4
  550d
  shimano altus
  135
  core ii quad
  pci express x16
  aaa

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