The best replacement for radeon is nvidia.

The best alternatives to radeon are rated as following:
★★★★★  nvidia
★★★★★  geforce
★★  gtx
★  nvidia geforce
★  firegl
★  firepro
★  fglrx
★  geforce comparison
  radeonhd
  ati
  fx
  geforce better
  intel graphics
  nvidia linux
  nvidia better
  nvidia graphics cards
  nvidia video cards
  invidia
  intel graphics media accelerator
  g force
  nvidia for gaming
  amd radeon
  geforce nvidia
  sapphire
  g-force
  nvidia graphics card
  quadro
  geforce 9600
  all in wonder
  ati radeon

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

Other search terms related to radeon and their ratings are:
★★★★★ intel
★★★★ nvidia physx
★★★ physx card
★★ geforce
★★ physx
★★ nvidia for physx
kms
You have in mind a companion for radeon and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of radeon in all years. Click on graph for more.
radeon
nvidia
geforce