The best replacement for x86 is x64.

The best alternatives to x86 are rated as following:
★★★★★  x64
★★★  arm
★★★  i386
★★  amd64
★★  sparc
★★  64
★★  x64 windows 7
★★  x32
★  x86-64
★  x64 windows 8
★  risc
★  x64 how to tell
★  x84
★  i686
★  64 bit
★  powerpc
★  x64 windows xp
★  mips
★  ia64
★  x64 mac
★  32 bit
★  x64 vista
★  ppc
★  instruction
  arm performance
  x64 linux
  any cpu
  program files
  x64 difference
  i586
  x64 how to tell vista
  x64 java
  x64 architecture
  x64 better
  x64 processors
  x64 performance

Your alternative for x86 is not listed? Suggest!
Speaking about x86, one probably shouldn't forget about x64.

Other search terms related to x86 and their ratings are:
★★★★★ x64
★ virtual box
You have in mind a companion for x86 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of x86 in all years. Click on graph for more.
x86
x64
arm