670 overclocking stability?

Hardware Overclocking
1

So today I overclocked my 670 power edition to 1319 mhz core 3505 mhz memory, ran about 10 different tests in kombustor to find my (near) max overclock (+140 at the moment, it started crashing at 150) I have my voltage on 1.175 and my power usage at max (114% maximum) after about 40 minutes of stress testing at 1920 x 1080 In kmbustor my card seemed perfectly stable (for the entire 40 minutes it was running maxxed out at 1319 mhz and 3505 mhz). I then decided to test on unigiene heaven 4.0 (at ultra settings, 1920 x 1080) and I found it would blackscreen for a few seconds, then come back at around 5-6 fps until I tweaked my overclock.


Is there a way to fix this?
Am I doing something wrong?
Why didnt it do this for the 40 minutes stress test plus the 10(ish) tests I put it through before that?

Thanks for any answers!  

2

Well it does sound like there may be a Problem with you OC, but try playing a game or running Unigene Valley, Heave gave me so many problems when trying to OC my 7950, but Games and every other benchmark worked flawlessly.

3

Ill go try metro 2033 for a few minutes then ill post my results. Thanks for the reply

 

4

does it in metro aswell, except metro full on crashed rather than with frame lag. Lowered my gpu clock by 10mhz, ill do some extra testing when I have time