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Just got a R9 290 Tri-x from members market and run my usual tests on it and even played a few games with no crashes, but when idle I keep getting crashes. Windows 10 locks up on a black screen mostly and I have to hold the power off button for 5 seconds in order to turn pc off. It is not a heat issue btw. It happens when 40-45C.
I uninstalled drivers, run DDU in safe mode and installed latest drivers, still same problem.
I get the feeling it is caused by Wattman which is applying high voltages on lower power states. By default voltage is on auto, but when toggle over to manual most states are 1250 with some being 1212, but the lowest one is 1250 which is obvious way to high and is likely why I get the lock ups I assume?
Can someone else with a R9 290 share with me their voltages for all the states so I can manually enter them please?
@AMDMatt - I know you are very busy right now, but any ideas?
I used to have a Tri-x 290 with the same issue and if i recall correctly a bios update fixed it. Check the TechPowerUp bios database to see if a newer one is available.