The best replacement for x2 is x3.

The best alternatives to x2 are rated as following:
★★★★★  x3
★★★  intel core 2 duo
★★★  core 2 duo
★★★  sfp+
★★  incredible 2
★★  xenpak
★★  pentium d
★★  tatsu
★★  fx
★★  droid 3
★  x4
★  2x
★  x1 comcast
★  opteron
★  x1 xfinity
★  intel core duo
★  droid razr
★  x26
★  droid incredible 2
★  phenom
★  droid 2
★  x vario
★  droid bionic
★  droid x
★  c3
  droid 4
  m8
  droid charge
  rx1
  casio commando
  nokia c3
  core 2
  turion x2
  intel dual core
  intel core 2 duo processor
  gtx 280
  athlon ii
  athlon 64 fx
  goliath
  turion 64 x2
  duo
  64
  droid incredible
  htc thunderbolt
  crossfire
  bionic
  athlon ii x2
  athlon x2
  fuji x100
  conroe

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x2
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intel core 2 duo