I recently purchased a 390x to play Fallout 4, when I noticed that my PC would intermittently power off during the game. After much troubleshooting I discovered that the issue was the card overheating, perhaps because of the fan speed bug although this happened before the release of the Crimson drivers. I have been using SpeedFan to lock the GPU fans at 100% while playing games and I haven't had a crash since, but I just now noticed that my GPU temps are reaching 95 just while watching youtube videos, but the fans are still at 20% where I left them after closing my game. It seems like automatic fan control isn't working at all on my card. What could cause that and how can I re-enable it?
The fan issue was fixed in the recent driver versions. Go to www.amd.com/drivers and download Crimson Edition 15.12 for your operating system.