Hello
 
So recently i encountered that my pc would just go into a black screen after playing some more demanding games.
I have tried most of the conventional things to determin if something is faulty. Did all the ram, cpu and gpu stress tests.
Everything ran smoothly except for the heaven benchmark witch resulted in the same black screen.
It does not happen when I m grinding for 10+ hours on Lol.
 
i7 4770k no overclocking
16gb ddr3 ram
EVGA GTX 780 Ti SuperClocked w/ ACX Cooler 3 GB
1200w silent pro cooler master psu
 
I am at a loss what i could be.

what are stable volts? i didnt tinker with any settings since purchace.
the cpu does not go over 60 when crashing
gpu stays st 74 and a second before crashing goes to 78
room is max 20 and yes i cleaned it today even tough there was not much dust to begin with.
 
I am wondering if my psu might be failing since i bought it a good 6-7 years ago.

If you're using driver version 361.75 you may want to run DDU  in Safe mode and then install 361.43 instead; some systems don't always work correctly with every driver. 

Either the VCORE voltage is being reported incorrectly or you have a serious CPU or mobo problem. I'd check the voltage in your BIOS, but it should be around 1.0-1.2, not less than .05.

Bios &/ or check with Speccy (free for home use)
 
http://www.piriform.com/speccy
 
Make sure to set your RAM to the Mfg specification in your BIOS. (DRAM 1.488 seems odd) 
 
The volts in my sample, for the RAM is due to slight over-volt for the OC on this PC (DRAM 1.66V)
 
With power disconnected to the PSU: (cause the MB still gets power with the PC in OFF mode) Ground yourself
 
1) Confirm GPU PCIe power cords are fully seated, re-seat them
2) Confirm GPU is fully seated in PCIe slot and not sagging, properly held with mounting screw
 
Are you OC any part of your system?

everything I have is factory calibrated. I will try all that tomorrow.

speccy is giving me same range of reading
cpu vcore jumps around 0.100v to 0.200v

Use DDU to clean out your old graphics drivers then install driver 347.88. See if that makes a difference.

 
Too many +1's. Going to start calling you (Mr. +1)

So I used the event log to see what was going wrong.
And I see 2 times display 4101 warnings and one display 4115 warning.
These are during the black screen period

After hours of psu testing i have found that one of the connectors couldnt reach peak preformance. I guess 6 years was a good run.
Bought a new psu and it seems to be fine now.

PSU do not last forever; why I wanted you to look at stability of the Volts. 
 
Unstable volts = unstable PC
 
Glad running with a new PSU solved it for you.
 
enjoy your PC

TIM does not last forever either.
 
If your PC coolers are clean and temps are up , it may be time for some new TIM.
 
Arctic MX-4 has been my standard - no cure time - does not seem to dry out - great thermal properties.
 
ACX cooled GPU does need great airflow through the case to remove the heat it can dump.

Did you ever update your DX files after installing Windows 10? Most games will install the files that they need but there are a bunch of DX files not included in Windows 10.
Download here: https://www.microsoft.com/en-us/download/details.aspx?id=8109
 

Lots of complaints about Black Screen crashes with that game: http://steamcommunity.com/app/268500/discussions/0/412446292764202146/
A Google search will turn up lots of results. Just beware of anyone offering a 'patch' to download. These are usually viruses and will bork your PC. You may have to wait for the game developers to release a patch to resolve these issues. I don't play the game so I can't be of more help other than be careful about websites offering patches for download.