BSOD at 2 random times.

That is why I ditto you there. :)

It is display failure, apparently in normal system activities.

Code:

BugCheck 1000007E, {ffffffffc0000005, fffff8800f1a8dbb, fffff88005bb3228, fffff88005bb2a80}

Probably caused by : atikmdag.sys ( atikmdag+c7dbb )

Followup: MachineOwner
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The possible causes of this failure is .....

• A failing driver
• A failing GPU
• An overclocked system
• An overheating system.
• Failures from the part of the power supply

We noticed that the issue is occurring with multiple version of the display driver, including 14.4 WHQL which is a very stable one. So it is not a driver issue, apparently.

As the furmark stress test passed, we cannot say it a failing graphics card.

So it is something deeper issue at the hardware level, as I think. That is why I requested ICIT2LOL to guide you, he knows the hardware in depth.

Could I add too Arc it could be also a failing board slot?

Yes, that possibility is also there. A failing PCIe slot may also cause this issue.

Well my only suggestion is to find another (?spare that you know is ok) card and try it.

PS I have just looked the specs of that board and it has two PCi slots GIGABYTE H87-D3H (BIOS version F8) GIGABYTE - Motherboard - Socket 1150 - GA-H87-D3H (rev. 1.x) or do you mean one slot is already been taken up by something else?

Either way remove the other device and put the card in it's slot and vice versa again either way one is not going to work if it is the slot(s)