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Overclocking is not working at all on my 6990!! Why?

post #1 of 11
Thread Starter 
I have a 6990, and its on the oc'ed bios switch, i put the voltage to 1.25, 1000/1350, it crashes right away on kombuster/3dmark11, i put it to 1.2 voltage, it crashes, 1175 950/1350 +20 in ccc, it crashes, im afraid all these stalls and restarts gonna corrupt windows, and they are just annoying. its on water cooling, never hits above 60C 100% load
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post #2 of 11
Does the computer crash or is it just the VGA drivers?
post #3 of 11
That card is rated for 830/1250 and you're just skipping right to 1000/1350? And when you can't get it stable, you lower the clocks but you also lower the voltage? Really?

Try 900/1250 with 1.2 V.

Really, when you OC, you first do core clock and leave the memory clock at stock. You give it the voltage you want and bump it 20 MHz at a time until it gets unstable. When it does, you go back 20 MHz.

When you've done that, you reset the core clock and do the same thing with the memory clock. When you're done with that, you combine them and see if the card can run at those clocks (it'll probably take a bit more to OC both at the same time though).
Edited by B!0HaZard - 5/5/11 at 7:05am
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post #4 of 11
Quote:
Originally Posted by B!0HaZard View Post
That card is rated for 830/1250 and you're just skipping right to 1000/1350? And when you can't get it stable, you lower the clocks but you also lower the voltage? Really?

Try 900/1250 with 1.2 V.

Really, when you OC, you first do core clock and leave the memory clock at stock. You bump it 20 MHz each time until it gets unstable and then you give it the voltage you want and bump until it gets unstable. When it does, you go back 20 MHz.

When you've done that, you reset the core clock and do the same thing with the memory clock. When you're done with that, you combine them and see if the card can run at those clocks (it'll probably take a bit more to OC both at the same time though).
This !
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post #5 of 11
Quote:
Originally Posted by Kerian View Post
This !
Damn, I messed up that sentence about the OC procedure so bad... Fixed!
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post #6 of 11
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how can i stress test at the same time im changing the mem/core/voltage? and mean if windows crashes or freezes 20times, that cant be good. What are the steps u use?
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post #7 of 11
Quote:
Originally Posted by thrgk View Post
how can i stress test at the same time im changing the mem/core/voltage? and mean if windows crashes or freezes 20times, that cant be good. What are the steps u use?
You could open Furmark/Kombustor/whatever, run the test, close it again, change clocks, start it again, etc. or just leave it running, what else?

I've pretty much just written all my steps in my earlier post.
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post #8 of 11
Quote:
Originally Posted by thrgk View Post
how can i stress test at the same time im changing the mem/core/voltage? and mean if windows crashes or freezes 20times, that cant be good. What are the steps u use?
You dont do it at the same time.

Just go into afterburner change the core up 20mhz apply use kombuster for about 60 seconds, and repeat.

Do what biohazard said
    
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post #9 of 11
Thread Starter 
ok, so i saw something weird, i put voltage 1180 in AB, but in kombuster only said 1175 still, so its like its not taking the votlage change, kombuster did recognize the core change tho, could ccc, or something be holding the voltage? i have overdrive enabled, but no settings changed in it.
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post #10 of 11
Quote:
Originally Posted by thrgk View Post
ok, so i saw something weird, i put voltage 1180 in AB, but in kombuster only said 1175 still, so its like its not taking the votlage change, kombuster did recognize the core change tho, could ccc, or something be holding the voltage? i have overdrive enabled, but no settings changed in it.
I think CCC can override AB, but not sure. I'd recommend that you disable Overdrive though, I've had problems with it.

A possible reason is that Kombustor only reads voltage on start, not in real time.
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