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New 7970 getting less fps after OC

post #1 of 11
Thread Starter 
Just installed my 7970 using 13.3 drivers and for some reason after a little OCing my fps has dropped significantly. I was using Unigine Valley benchmark to test my OC and was getting around 45 fps on average at stock settings, but now when I run it at 1100 core clock with voltage at 1250 and +20% on the power I am getting around 30 fps with the same settings. I have Overdrive turned off in the CCC.

This happens about half the time, I can run the bench and get 30 fps and then rerun and get 45fps. Not sure what could be causing such a huge difference in average fps. I overclocked using Trixx, for some reason using Afterburner makes anything I do extremely unstable.
post #2 of 11
Try keeping the power at 0% i've heard changing it can have negative effects.
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post #3 of 11
Same thing happens to my GTX 680 if i go above 6800 MHz on the memory the FPS numbers drops like a rock

Try and go down a little on the overclock and see if that helps
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post #4 of 11
Quote:
Originally Posted by shilka View Post

Same thing happens to my GTX 680 if i go above 6800 MHz on the memory the FPS numbers drops like a rock

Try and go down a little on the overclock and see if that helps

I think the 680's have ECC memory though, not so sure about the 7970's.
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post #5 of 11
Might be throttling - how do your temps look? have you tried lowering the voltage. I know while im in the process of overclocking - as soon as artifacts show, some programs start to act really slow and i have to restart and raise the voltage and keep going
post #6 of 11
Thread Starter 
the highest the temps got were about 62ish. I'll try lowering the power limit back to 0%. while over clocking I never saw any artifacts or anything at all.
post #7 of 11
The card is throttling. You have two options.

a. Decrease the clocks some.
b. Force constant clocks to make the card hold speed, even when it doesn't want to. [using MSI AB]

Consequences of option (b) = card will never idle so you will be on the desktop with the card running as if you're playing a DX11 game maxed. Leads to higher temps when doing nothing. Idle temps will go from mid 30's to mid 50's. But at least you'll get all the performance you want redface.gif
I've done this before tongue.gif
Edited by iTzHughie - 3/22/13 at 1:20pm
post #8 of 11
Thread Starter 
MSI Afterburner yards my computer out, just raising the core clock by 1 with it makes the screen start flicker uncontrollably. I am not home right now but I will try to force the constant voltage with Trixx and see if that does the trick
post #9 of 11
Thread Starter 
Quote:
Originally Posted by iTzHughie View Post

The card is throttling. You have two options.

a. Decrease the clocks some.
b. Force constant clocks to make the card hold speed, even when it doesn't want to. [using MSI AB]

Consequences of option (b) = card will never idle so you will be on the desktop with the card running as if you're playing a DX11 game maxed. Leads to higher temps when doing nothing. Idle temps will go from mid 30's to mid 50's. But at least you'll get all the performance you want redface.gif
I've done this before tongue.gif
Forcing the voltage definitely solved the issue, much more consistent benchs. Before anything over 1160 core clock was causing a crash and now im up to 1200, gpu temp is staying the in the low 60s but in gpu-z the vrm temps are around 68-70c, what is danger zone for the vrm temps?
post #10 of 11
Quote:
Originally Posted by JaviJ01 View Post

Forcing the voltage definitely solved the issue, much more consistent benchs. Before anything over 1160 core clock was causing a crash and now im up to 1200, gpu temp is staying the in the low 60s but in gpu-z the vrm temps are around 68-70c, what is danger zone for the vrm temps?

I'm not exactly sure what the danger zone is, but if it isn't approaching 90+ you should be fine.
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