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I encounter same problem since last week with my R9 290. I am pretty sure it is related to windows 10 update or incompatibility with drivers. I get random black screens while gaming or desktops without errors on log (except the ones created by hard reset). Try to "force constant voltage" in MSI Afterburner and see how it goes. I still got black screens but it seems little more rarely.
Is your issue exactly how I describe? Interesting to say the least, I'm trying to prevent the hassle of RMAing my card.
I'm not sure why but it does not happen for me while gaming, only when just sitting at desktop after waking system from sleep or cold boot.
My system goes black screen especially in gaming and sometimes in idle too. Sound is still there for few seconds then in a loop. Also, sometimes gpu fans spins 100%. It only goes with hard reset (i have to reset/hard reset even 2-3 times. All started last week. All stresstests were fine. GPU CPU RAM
Issue may be solved:
Don't know if this has been already noticed here, but it seems that AMD has finally unblocked I2C access to VRMs on Vega.
Not sure if it's since Crimson 17.11.3, but with 17.11.4 it's surely there.
So now you should be able to see all GPU VRM details in HWiNFO including temperatures for both GPU Core and Memory VRMs.
Unfortunately some users started to experience crashes here and it happens when HWiNFO tries to access those VRMs via I2C. Some GPUs seems to be affected, some not. Don't know yet why is this..
If you're experiencing such hard crash during HWiNFO startup, then disable the "GPU I2C Support" option.