GNU/Linux Arch Installing AMD Radeon Open Source Drivers Guide
Hi! The Tutorial shows you Step-by-Step How to Install AMD Radeon and ATI Open Source Graphics and GPU Drivers in Arch GNU/Linux Desktops.
And Open Source Radeon Graphics Drivers for Arch includes Updated Free Graphics Drivers for AMD Graphics Cards.
Especially relevant: as a complement you may be intesested also to the MESA Graphics Drivers Suite Setup.
GNU/Linux Arch AMD Radeon Driver Installation Guide