Heaven Blackscreening= Instability?

[xDEATH48x]

Hi I've been trying to overclock my MSI GTX 670 PE core clock for some time now and I can't seem to add anything to it without Unigine Heaven blackscreening for a couple seconds then it continues. I've set power target to max 114% but this doesn't help. Is this a sign of instability? I haven't had any problems with 3D mark 11.

 

[Nuclear101]

Yes, that is a sign of instability. Try taking it down a few hundred Megahertzs and see if that solves the problem. Also, what is your GPU temperature while running Unigine Heaven? Also, what PSU are you using?

 

[xDEATH48x]

Thanks for the reply. It runs fine at stock clock- 1020 base, 1098 boost, and kepler boost of 1202. Its once I add on more that the blackscreening starts happening. I've upped the memory to +500mhz and didn't see any artifacts and no crashes there. My temps don't get that high while running Unigine benchmark-56*c at stock settings. My power supply is a Corsair TX650w.

 

[Nuclear101]

You should also increase the core and shader clocks while increasing memory clocks, which may be a cause of the crash, but if you already did, then it might just be too much.

 

[xDEATH48x]

Im sorry. I didn't tell you that when i try increasing my core clock that is by itself. The only other value changed is the power target to maximum 114%. I did the same for memory just maxed the power target and change the memory clock by itself. I enabled the legacy MSI Afterburner skin for shader clocks but it appears they are linked directly to the core clock. I will try adding a little to each core and memory and see if that helps or not.

Thank you again for your reply.