The best replacement for gpu is cpu.

The best alternatives to gpu are rated as following:
★★★★★  cpu
★★  apu
★★  fpga
★★  graphics card
★★  cpu mining
★★  cpu for gaming
★★  gpu
★  cpu bottleneck
★  display scaling
★  xbox 360 gpu
★  video card
★  cpu rendering
★  asic
★  sli
★  cpu performance
★  ps3 gpu
★  cpu gaming
  software rendering
  cpu upgrade
  cpu benchmark
  310m gpu
  360 gpu
  cpu physx
  cell
  dsp
  memory clock
  asic mining
  ps4 gpu
  cpu video encoding
  cpu bitcoin mining
  gaming gpu
  cpu for rendering
  cpu flops
  agp
  cpu for physics
  pc gpu
  igp
  ppu
  crossfire
  cpu difference
  intel phi
  processor

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

Other search terms related to gpu and their ratings are:
★★★★★ apu
★★★★ thermal paste
★★★★ cpu
★★ opencl
★ matlab
★ sli
★ crossfire
intel cpu
You have in mind a companion for gpu and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of gpu in all years. Click on graph for more.
gpu
cpu
apu