Thank you Andy for the V4. Everything seems to work fine here.
Though I am still not able to boot with arch=x86_64 kernel flag - getting into reboot loop.
Also I had to patch Firefox as it was randomly crashing. After patching with your AMD patcher it now seems to be stable.

Also I have a question: how do I determine which files need patching? I previously used Marvin AMD utility, which scanned all files in a specified directory and created a patcher package. Unfortunately Marvin utility does not work in 64-bit mode...

Thank you,
FX