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*Puts on shades* 5850 overclocking time, advice? - Page 2

post #11 of 33
furmark and kombustor are useless. they just rape your card and its VRM's....

I can set clocks that pass furmark without issue but if you try to run 3d mark vantage, artifacts everywhere and all is not well.

use game benchmarks and 3D marks and stuff to test stability. please
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post #12 of 33
I do 10-15 minutes ATI Tool to check for artifacts while I'm looking for quick stability.
Then I'll usually run Kombustor for 15 minutes when I have my overclock approximately where I want it.
OCCT GPU test for 1 hour for my final stability test.
post #13 of 33
Quote:
Originally Posted by alex98uk;12458073 
8 hours... for a GPU!?

I would say 30 minutes would work fine...

I agree, 20 minutes is usually fine. You'll see any issues pop up while gaming.
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post #14 of 33
Push the core clock / memory separately.

Up your clocks by a little and test until they become unstable, e.g. once you start seeing artifacts etc in your testing.
From there you can either back off by 10-15mhz to determine stability at your current voltage and/or up the volts to accommodate higher clocks.

Core clock is more important as it will yield better performance gains, so see how far you can get with that first then move to the memory.
Now the memory is going to be a little different; it has error correction so you're going to need to keep an eye out for diminishing returns in performance (even a loss) once you push the memory clocks too high.

1.3v is about the highest you're going to want to put on the card, but make sure you keep an eye on your temps incl. your VRMs which you'll be able to view in GPUz.
A 5850 is within 3-8% of a 5870 clock-for-clock, so it's definitely a nice bump in performance once you push the card.

Good luck and have fun floggin that card devil-smiley-019.gif
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post #15 of 33
Thread Starter 
Quote:
Originally Posted by alex98uk;12458073 
8 hours... for a GPU!?

I would say 30 minutes would work fine...

Haha, the only reason I let it run THAT long was because I went to sleep like I said. I would have only let it run for about 25-30 if I was at the computer itself.
Quote:
Originally Posted by BababooeyHTJ;12458150 
I agree, 20 minutes is usually fine. You'll see any issues pop up while gaming.

Indeed.
Quote:
Originally Posted by wumpus;12458112 
furmark and kombustor are useless. they just rape your card and its VRM's....

I can set clocks that pass furmark without issue but if you try to run 3d mark vantage, artifacts everywhere and all is not well.

use game benchmarks and 3D marks and stuff to test stability. please

So you're going against every overclocking guide on reputable sites that says Furmark and or Kombustor are perfect for stability testing?
post #16 of 33
OCCT will find any instability that Furmark and Kombuster will miss, but honestly if it passes a half an hour in Furmark and doesn't crash in any of the games you play you are good to go. Source based games are a great way to test for stability, any pride I had in my GTX260 overclock was shattered by Day of Defeat source.
    
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post #17 of 33
Quote:
Originally Posted by E-Peen;12458190 
So you're going against every overclocking guide on reputable sites that says Furmark and or Kombustor are perfect for stability testing?

Yes, he is.

Clocks that pass these "tests" often times fail in games. Plus, they put a severe and unnecessary strain on your voltage circuitry...

If you're testing for game stability... then game. No point in being "furmark" stable when the ultimate goal is gaming.
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post #18 of 33
Does the OCCT tool check for memory errors? I can't do GPU Mem because I don't have a CUDA card, but will the standard GPU: OCCT work?

I maxed the core at about 1000mhz, but I want to work on the memory which is atm, only 1100mhz.
post #19 of 33
Quote:
Originally Posted by alex98uk;12458263 
Does the OCCT tool check for memory errors? I can't do GPU Mem because I don't have a CUDA card, but will the standard GPU: OCCT work?

I maxed the core at about 1000mhz, but I want to work on the memory which is atm, only 1100mhz.

If you're referring to a 5850 as with the OP there won't be any memory errors thrown; it's ECC.
You need to push the memory gradually and check for diminishing returns in performance; which will be easier/faster with stress testing tools rather than loading into a game w/ FRAPS every time you want to test.
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post #20 of 33
Thread Starter 
Yeah, thanks for the replies everyone, appreciate your input! +reps handed out.

I just cleaned out my rig after a long time or not cleaning it, got rid of all of the dust.. There was dust everywhere, haha. GPU temps dropped almost 10c idle ^_^

So, from what I've gathered...

I read in almost all guides to increase the memory (first) in 5-10 intervals, run 15 mins of Furmark, no errors, increase again.. etc until I get an error/artifact. When I do, drop it until I don't.

Then do the same with the core after you've found your memory peak, then run it 100 crysis loops/heaven 2.0/hours of gaming, etc.

Sound good?

So far I'm 1230 memory with no artifacts/errors, wonder how much higher it'll go.
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