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First of I am running-
FX 8350
Gigabyte 970 Gaming
Corsair 850 PSU
14 gigs DDR3
MSI R9 390

My screen goes black after several mins of play a video game. PubG or SCUM.
I ran GPUZ to seen what graffix card was doing.
12V - 11.38 to 11.75
VDDC - .898 to 1.266
VDDC1- 1.0
It seems as though the 12V is running a little low.

That variance on the 12V rail isn't going to give you a black screen.

1., check GPU temps. Anything over, say, 85C is pushing it. See where you're at.
2., take that bad boy out, blow it out with compressed air just to avoid any mitigatable dust issues.
3., check drivers. Update them if necessary.
4., check the cables. try a new one if you have a spare.

5. report back!

To add to Jack's points, try running the games with IGP or another graphics card (if available -- sorry, I don't recall if the FX series has onboard graphics or not). The game play will be very slow of course, but seeing if the black screen happens or not can help isolate the source of the issue.

I went ahead and ran card through Super Position after I checked connections and blew out what little bit of dust was in it. This is what GPUZ recorded. Mem Usage Mem Usage
Date GPU Clock Mem Clock Temp Fan % Fan RPM GPU Load Men Controller % Dedicated Dynamic 12V
2018-09-28 15:54:22 , 1040.0 , 1500.0 , 59.0 , 74 , 2174 , 100 , 40 , 1787 , 91 , 11.50 ,

VDDC VDDCI VDDC Current in VDDC Current out VDDC Power in VDDC Power out VRAM temp 1 VRAM temp 2
1.195 , 1.000 , 16.0A , 138.5 A , 197.8W , 154.5 , 57 , 50 ,

That did not show up like i thought it would. Sorry. But all numbers looked good.

Yeah it looks fine. 74 C isn't crazy at all. Power doesn't look crazy either.

It's not terribly likely, but have tried another cable? Windowed mode on particular games? Drivers?

I don't know exactly what is causing your problem, but I have a hypothesis. Back in the day I had a 4870, and AMD released a hotfix beta driver that screwed up something with clockspeed and fan profiles, and my 4870 baked itself sitting on the desktop overnight. In particular, I think the memory fried, and there was all sorts of graphical corruption like lines across the screen and static. I got a free upgrade out of it, so I'm not complaining about that. This is just a background story that I feel is related, and has caused me to be cautious about similar situations.

That said, ever since one of the early Crimson updates, AMD removed comprehensive memory power states from the 390, and the only existing profiles left are 150 mhz and 1500 mhz. The card constantly switches between the two depending on use. Simply watching youtube is enough to cause clockspeeds to rise. Also, adding a second monitor pegs the memory permanently at 1500 mhz.

Memory clockspeed does not affect fan speeds, since only GPU temperatures cause fan speed increases. IMO, AMD's negligence on this issue is dangerous and could cause the memory to cook itself, let alone is an issue with power efficiency. That said, it seems the only ones who seems to care about this issue are me and a few posters in AMD's support forums, because AMD has completely ignored it, and tech websites who previously wrote about bumpgate and later on Nvidia's desktop efficiency bug are also completely ignoring this issue.

I'm not saying this is your problem, because it could very well be powersupply, driver, display cable, or thermal paste related. However, I don't think 1500 mhz sitting on the desktop is safe long term, and it could eventually cause hardware failure. If you rule out everything else, I would guess that you are one of the first to have a card die from AMD baking the 390's memory by running it constantly at 1500mhz on the desktop, and hopefully AMD will address it from people finally complaining after their cards die. I guess this is AMD's idea of planned obsolescence, since they don't drop driver optimizations like Nvidia.

Anyways, I finally purchased a decent Vega 56 that I found on sale along with a MIR, so my 390 issues are behind me and I'm sure I'll find all sorts of new ones with V56. I'll probably start hearing mandatory dial up sounds every time I log in as the default sound scheme, among other things.

Not sure cable would be issue. I have a RX 560 that works fine. It does not require the power that the 390 does. That is why I thought power might be issue. Well maybe Ill try to RMA it. Its an MSI R9 390.