GPU crashing after several hours of gaming on overclock

[Sashgnarg]

So I overclocked my 970 and these are my results

 

I dropped my core clock and memory clock by 15 because my computer crashed but I'm not sure if that's even the issue. My temps with these settings remained 65 but for some reason after like 5-6 hours of gaming my whole computer freezes and I have to restart it.  I ran Valley benchmark for a good 20 minutes and no artifacts appeared, and gpu looked stable. Is there another issue?

[corrado33]

14 minutes ago, Sashgnarg said:

So I overclocked my 970 and these are my results

 

I dropped my core clock and memory clock by 15 because my computer crashed but I'm not sure if that's even the issue. My temps with these settings remained 65 but for some reason after like 5-6 hours of gaming my whole computer freezes and I have to restart it.  I ran Valley benchmark for a good 20 minutes and no artifacts appeared, and gpu looked stable. Is there another issue?

Yes, your OC is unstable. Run valley for 24 hours. It'll likely crash as well. Lower the OC until it doesn't crash.

[pstarlord]

I'd say make sure it can pass a stress test that lasts as long as you'd game at one time.  So, let it go while you're sleeping, if its still going in the morning, then you're good to go.  Personally, I give my GPU a little break every 1 - 2 hours when I'm gaming, just to be on the safe side.  Enough time to grab a sandwich or whatever.  

[Mick Naughty]

No added voltage? Isn’t stable, need to make it stable. Assuming the card can handle it. Could be out of power too. 

 

Testing and monitoring the card properly normally helps you find what is stable or why it isn’t.