I only have a few XFX cards spread across three rigs. I did like them as they have a slightly higher hash rate, but I can say with certainty now that any instability with those three rigs is 100% from the XFX cards. The fans on XFX cards refuse to respond properly to the AMD drivers (I tried all driver versions, BTW newest does not work). I have one card that will sit with one fan off past 90C. The other two need external airflow just to stay below 70C. I missed this for the last 10 months as I have extra airflow on all my rigs and push them hard so they auto restart often. All my Nitro cars run at <60C, all the time, on same rigs. Perhaps they have fixed this in the 580 or Vega but I have moved to more efficient GPU’s for Zcash.
I get irritated when I can smell cards burning but one fan refuses to come on (every XFX card I have does this). Does not matter what you change in the BIOS or the AMD drivers. I will never buy these cards again for mining, but it does not sound like this is an issue for Windows miners.
I have moved all XFX cards to a test rig. My rigs all auto restart, so I plan to run them into the ground until they burn up. The test rig is auto restarting about every 10 min, hitting 90C and crashing. Way better than these cards restarting three of my main rigs for one hot GPU every 10 min.
My Nvidia rigs do not have this problem, software automatically reduces power if a GPU hits 70C, then increases it again if the temps drop again. Deals with day and night temp fluctuations nicely but airflow over multiple rigs is critical for farm cooling, can be a pain, each building HVAC system is different.
These XFX card have been running 10 months this way so perhaps they will just keep going, but I plan to push them hard just for spite…