UPDATE THE BIOS USING THIS VGA Bios Collection: Gigabyte RX Vega 56 8 GB | TechPowerUp (or search for your manufacturer if its not Gigabyte )
Im using the default settings, with the lastest driver version, turned off zero rpm, changed the fan speed and power limit -50%
EDIT UPDATE MID 2020
Radeon pro drivers seems to fix all problems
I have the same issue with the same card, also DP and HDMI connections if this is important at all. Also tried just about everything, undervolting, underclocking, increasing power limit, decreasing it, different rails and so on. I have Corsair 750W PSU, but it worked like a charm with my previous 390X. I did notice a pattern, after turning on the computer and gaming (or doing a stress test) for some time (on my computer it's usually no more than 10 minutes) a blue screen with THREAD STUCK IN DEVICE DRIVER will appear. If I only reset on each subsequent gaming/stress test fans will ramp up to 100% and a black screen will appear. If I turn it off then I am back to a blue screen.
Submitted to both Gigabyte and AMD. I was hoping someone might suggest a driver, if this is driver related at all, that works. I guess a driver automatically provided by Windows 10 works for alexx855 . I don't know what driver that is, but I will try it just as an intermediate solution.
I can confirm it is indeed a driver issue. Windows installs Radeon Software Version 17.7 and there are no issues with it. I will try higher versions and hopefully find out at which version the issue starts.
It seems it is more complex than I would like it to be. Already on 18.12.2 drivers the issue is back, but a little differently - it takes longer to crash the system (about 30 minutes of gaming on my rig) and there are no blue or black screens only a total freeze. It does amount to the card being useless. We both have the same Gigabyte Vega 56 OC, but everything else is different.
|Monitor||Asus MG279Q monitor on DisplayPort (Freesync) + HDMI (TV)|
|Motherboard||ASRock Z170 Extreme6+|
|BIOS||American Megatrends P7.40|
|CPU||Intel Core i7-6700K, 4 Cores, 4400 MHz (44 x 100)|
|RAM||32 GB (4x8GB DDR4-2133)|
Finally i found people with the same problem.
I have the same gpu. Gigabyte vega 56 oc 8gb. I even RMA the card as my new build kept crashing.
Turns out as you say its a driver problem. If i do a clean install of windows and let the default drivers installed the pc works perfectly.
If i update to any other version the crashes begin.
Hope we all find a solution asap.
After more testing and a lot more reading I will RMA the card. It's a complex stability issue and I cannot wait/hope Gigabyte/AMD will stumble upon the solution any time soon.
nixsar i've read about a lot of people that sent the GPU to RMA, and they still have the same issue with the new ones, there are also topics on reddit about this, you can use the default windows drivers, these works perfectly, no crash in months, i know that it is not ideal, that was the reason because i opened this topic.
If your problem is the same as ours i wouldnt recomend rma. I send it and they told me everything was ok. I gues even with a new gpu it would still happen.