Need help with strange DX11 crash

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Joined
22 Apr 2012
Posts
16
Short story: PC crashes after a period while running anything DX11.
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Long story:
My first crash happened in November. My screen went black while playing World Of Tanks and audio stuck on loop. Restarted, and noticed no picture on monitor. In fact no input. I try again, and same. I then plug monitor into mobo port and screen comes up. I assume GFX card bust, send it back to OC for RMA. Returned without a problem. Plug it back in and it works. Strange.

Next day I play World of Tanks again, and after a while the same thing happens. I speak to some people who say it's either my motherboard or PSU. I switch out motherboard and CPU for older i5 3570k. Works. No problems. After a few weeks, I send motherboard back and order a new one, but different model.

When I rebuilt my system, there was no problems. Been on Civ5 , CS:GO, FarCry 3 etc for hours at a time. I even played a few games of World Of Tanks every now and then.

Then today I start World Of Tanks up at around 10:00am. Playing it right up until 14:00, when I crash. "Hmm, strange must be game bug". Restart and reload into the game (I was in middle of a game). Continue playing till someone kills me when I crash again. "FFS what now". Restart. GFX not working. I sigh, try mobo graphics: Works. "Oh ****".
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So it seems, that for some reason I now have the same fault AGAIN. Error logs from November point to DirectX11. But no error logs today.

The interesting thing is, all my crashes occurred after roughly 4 hours playing world of tanks. I tried other games and nothing happens.

My current mobo is MSI Z87 GD65, and my previous was the MSI Z87 G45; both running the same i5 4670k. However my 2nd system was using an i5 3570k, and yet I had no issues, even after 5 hours on World Of Tanks.

So after two separate crashing events, the best I can come up with is that some weird DirectX11 bug, causes my GFX card to crash and sometimes make motherboard ignore it when on intel 1150 socket; when I play World Of Tanks for around 4 hours in one session without restart.

I know, makes no sense....

Can anyone help me make sense of, and fix this?
 
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Little addition: I can no longer play any DX11 game for more than a few minutes.

And another strange problem, my Win 7 install disk won't allow me to repair my install because apparently I have a different version installed...
 
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