Broken drivers for me. I do not remember the last time I had issues with AMD drivers. Maybe on of the early Crimsons?

Games suddenly dropped from 70 frames to 25-30 and stutter like hell. Turns out the memory clocks were dropping from 1500 to 150 and staying there for no reason.

Adding Sapphire Trixx back helped to stabilize the clocks, but any game using Freesync would cause the screen to flicker like crazy.

Cleaned up with DDU and reverted back to 16.11.5 and I even got better performance than with the 16.12s.

Seen quite a lot of postings on this in various forums. Could it be that AMD is starting to EOL Fiji?