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HD7950 core clock fluctuations

post #1 of 5
Thread Starter 
Hi all.

Yesterday I posted a topic about that I was afraid I ruined my GPU.
Now that is out of the way, it's time to OC this card the right way.

I bought an ASUS HD 7950 DC2 TOP V2.
Standard settings are :
Core clock : 900 MHz
Core voltage: 1094 mV
Mem clock : 1250 MHz
Mem voltage : 1600 Mv

Now, I raised my power limit to 120% to deliver enough juice, and I've got a 'stable' overclock until I reach 935 MHz. At this point, when I stress test my GPU, my Core clock begins to fluctuate enormously. I pumped the core clock up to 1000 MHz. It varies from 810 to 1000. Strange thing is, it does not show any artifacts, nor does my screen go black or freezes. And when I play games with these overclocked settings, I do see an increase of performance AND my Core clock does NOT fluctuate..

These fluctuations are noticed in MSI Afterburner (version 2.3.1, latest version).
When I use ASUS' tool to monitor my GPU stats, it also does NOT show these fluctuations.

Here's a pic of the Core clock fluctuations, and other stats:


Is there anyone who can help me with this? Who knows how to fix it? Who knows what causes this problem? Any help will do! smile.gif
Sleeving Gallery
(11 photos)
  
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Sleeving Gallery
(11 photos)
  
Reply
post #2 of 5
Sigh... don't use Furmark. Its a furmark issue. AMD purposely cause cards to downclock to prevent damage. Just don't use Furmark, its a POS.
post #3 of 5
you might need more core voltage and also as posted dont use furmark try 3d mark 11 or ive been using occt and evga oc scanner aswell as 3d mark.
i had issues similar to this with the boost bios on my card. since i flashed it to a normal bios its been ok
post #4 of 5
Quote:
Originally Posted by richie_2010 View Post

you might need more core voltage and also as posted dont use furmark try 3d mark 11 or ive been using occt and evga oc scanner aswell as 3d mark.
i had issues similar to this with the boost bios on my card. since i flashed it to a normal bios its been ok

Increasing Voltage would make the issue worse, not better. You want the power limit to stay down too. OCCT is junk too. I've noticed my card at its stock 900/1250 (I have the same card as the OP) it'll fluctuate to under 800 mhz as well.
post #5 of 5
your cards didnt come with boost bioses on them did they becasue this is what was happening to me untill i flashed another bios to it, my boot bios was 840 1250 with 1.25 n 1.55v and i flashed to a non boost at 880 1250 with 1.094 1.6 and i dont get these issues anymore. i think the new bios had a higher power limit in the bios
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