Crashes at random intervals-1x7950 1x-7870xt

[ccplz]

Hello,I'm facing difficulties mining with my rig.
Once I start mining,everything will go smooth,for an hour or so,sometimes longer or shorter,it's really random,then bam,black screen and hard reset.
GPU:1x7950(gigabyte) 1x-7870xt(sapphire) both relatively new(Running at 19 intensity,24000 thread concurrency at 77/69 degrees.)
PSU:Corsair TX850W v1,new as well.
CPU:Intel i5-2500
RAM:8gb DDR3 ram.
Mobo:Gigabyte GA-P67-DS3-B3
I've tried everything these past days,from removing and reconnecting every cable,to switching the cards to another PCI-E port.

What I ask of you is,can you pinpoint the piece of hardware that is causing the problem?
Please note that the rig used to work normally 2 weeks ago.

At this point I'm considering buying a new motherboard,is there any chance that it's the one malfunctioning?

Thanks in advance.

[ccplz]

(Bump in disguise)

So I decided not to mine tonight,and I figured out that the pc will still reset randomly,even when under 0 load.Any ideas?

[Slave2school]

Sounds like bad ram or psu.  Try memtest86.

[jdebunt]

i've had an issue like this on an old computer of mine (well, not old, one of the previous comps)

It used to run fine on max level, then blue screen & hard resetted.

It was , as Slave2school mentioned, a RAM issue.

I had to go into the BIOS & downclock the ram, because else it'ld overheat pretty fast.

I ended up replacing the ram & everything worked fine for 4 years

do a memtest & see what it tells you or try downgrading the ram speed in the bios.

[rtgornik]

What OS are you using. If Windows, is it a BSOD?

I have a similar problem with one of my rigs. Although I didn't run memtest, I did run the built in Windows Memory Diagnostic tool (Control Panel -> Administrative Tool -> Memory Diagnostic). This test essentially froze. I swapped out the memory and now I'm hashing away. The BSOD would happen pretty quickly before.

In the past, I've also had random BSOD and crashes due to a bad HDD that even passed HDD checking tools like spinrite!

Best of luck!

[Slave2school]

One set of ram I had would refuse to run at all with any manual/default auto settings (probably a bios bug) but I found that if I forced the xmp profile it would work fine.  This was with some "fancy" Ripjaws ram and a gigabyte 990fx board.

[ccplz]

Thanks for all the posts,I tried unhooking every piece of hardware I didn't need and apparently the one causing the restarts was the dvd drive.
Now that I disconnected it,it has been working fine for 6 hours+

[rtgornik]

Thanks for all the posts,I tried unhooking every piece of hardware I didn't need and apparently the one causing the restarts was the dvd drive.
Now that I disconnected it,it has been working fine for 6 hours+

Very interesting.

Just goes to show you, try EVERYTHING and try it one at a time.

I'm glad you seem to have found the solution!