The best replacement for amd radeon is nvidia.

The best alternatives to amd radeon are rated as following:
★★★★★  nvidia
★★★★  nvidia geforce
★★★  nvidia gtx
★★  intel hd
★★  ati radeon
★  intel hd graphics
★  nvidia which is better
  intel hd 4000
  ati
  geforce
  radeon

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

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



Google Trends

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