we are having serious problems using R9 Fury cards under CentOS. It seems like your latest driver just let the card overheat, which usually happens under 5 minutes of intense computation resulting in driver crash and need of reboot. To make sure it's not our product fault we put the card under stress test using LuxMark 3.1, with the same result. Windows driver however seems to work just fine.
So far tested with the following drivers: