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Questions about OCing a 580

post #1 of 9
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I've been playing around with my new setup and trying to squeeze out a few more FPS in warcraft. I started OCing my 580's the other day and I noticed that I was getting some artifacts in WoW after 940mhz core clock.

Question #1: Does more voltage to the cards reduce artifacts in games or is it a limitation of the cards that means you can't OC any more?

Question #2: Given that I noticed artifacts at core speeds over 940 I decided to tune the voltage down to lower the temps of the cards some. Is Kombustor within MSI's Afterburner a good way to test the stability of an overclock or is there a better method?

My cards are EVGA 580 Black Ops editions. I ran Kombustor for 1 hour at 940mhz core clock, 2200mhz mem clock at 1.025V. Fan speed was at 100% for the test. The cards are stock minus an EVGA backplate and evga's fan speed unlocker. Card #1 stayed at 58-59 degrees for the duration of the test and Card #2 stayed at 54 degrees.

The voltage was set at 1.088 when I got the cards (which I'm assuming is stock for EVGA SC cards) and I was able to easy push it to over 1000mhz core clock at that voltage and temps stayed exactly the same. I didn't go any higher but I'm sure it can. Is there a way to get rid of the artifacting?
    
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post #2 of 9
WoW gets all weird with multi card set ups, unless you're using surround try it with only one 580, you will likely get more fps.

From my experience Kombutor is a good way to see flaws in gpu overclocks. As far as voltage goes the higer the oc the more voltage it takes, its not on a linear scale so the higher you go the voltage you need per mhz grows. That seems like a high oc for 580's thats probably the chips limit or near it.
Edited by Vap0r87 - 4/21/11 at 11:54am
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post #3 of 9
If you see artifacts it means that the GPU doesn't have enough voltage, need to crank it up some more until the artifacts stop (or until you get to the limit on Afterburner which is where I would recommend stopping)
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post #4 of 9
If you need more FPS in World of warcraft, why are you fiddling with your GPU? a HD 5770 can power WoW all by itself on 3 screens...

What you must Fiddle with is your CPU, WoW is incredibly CPU intensive, so that is where you must go to get more FPS.
post #5 of 9
Thread Starter 
Quote:
Originally Posted by pangeltveit View Post
If you need more FPS in World of warcraft, why are you fiddling with your GPU? a HD 5770 can power WoW all by itself on 3 screens...

What you must Fiddle with is your CPU, WoW is incredibly CPU intensive, so that is where you must go to get more FPS.
My 2600k is overclocked to 4.6 and I've played with trying to get more out of it than the autosetting in the BIOS of my maximus IV. I'm fairly new to this whole OCing thing and I can't seem to get anything more than that to run stable in Intel Burn Test. Most likely its due to me not knowing exactly what to tweek but I did notice some pretty significant gains in FPS when I OC'd my 580's from stock to where it is at now. I'm running a surround setup with 3 23" monitors so I'm not even sure if I'm CPU or GPU bound.

I've got v-sync and triple buffering turned on as I get some nasty tearing with them turned off when I'm not in a graphically heavy zone. Basically the only time I dip below 60 FPS is when I'm hovering over SW high up to where I can see all the buildings and the harbor or when I'm in an area that has a lot of trees. All graphics settings are maxed out.
    
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post #6 of 9
only use furmark or kombuster to read temps, best way to test stability is by gaming.
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post #7 of 9
Quote:
Originally Posted by pangeltveit View Post
If you need more FPS in World of warcraft, why are you fiddling with your GPU? a HD 5770 can power WoW all by itself on 3 screens...

What you must Fiddle with is your CPU, WoW is incredibly CPU intensive, so that is where you must go to get more FPS.
This isn't actually true. While WoW does definitely utilize CPU resources more than other games, it's still the GPU that is going to give you the biggest gains. Especially if you have DX11 enabled, you will continue to see improvements with a good OC.

Completely maxed out (including max viewing distance), a 5770 would not cut it. People are always surprised at how well WoW has kept up there. Yeah, it's not a Crysis 2 or whatever, but give it some credit.
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post #8 of 9
Quote:
Originally Posted by MaltIR View Post
My 2600k is overclocked to 4.6 and I've played with trying to get more out of it than the autosetting in the BIOS of my maximus IV. I'm fairly new to this whole OCing thing and I can't seem to get anything more than that to run stable in Intel Burn Test. Most likely its due to me not knowing exactly what to tweek but I did notice some pretty significant gains in FPS when I OC'd my 580's from stock to where it is at now. I'm running a surround setup with 3 23" monitors so I'm not even sure if I'm CPU or GPU bound.

I've got v-sync and triple buffering turned on as I get some nasty tearing with them turned off when I'm not in a graphically heavy zone. Basically the only time I dip below 60 FPS is when I'm hovering over SW high up to where I can see all the buildings and the harbor or when I'm in an area that has a lot of trees. All graphics settings are maxed out.
your complaining that it dips just below 60fps?!?

if i was you i would leave your cards stock and undervolt them. until you actually need to overclock them to get playable frame rates.
    
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post #9 of 9
As mentioned, adding voltage (or lowering clocks) is the usual course of action for removing artifacts.

They are *generally* a sign of too high an OC for the voltage supplied. This won't *always* be the case though, as temps too can cause artifacts ... and before you say 'but my GPU temp is only 70C (or whatever)', remember that's the temp of ONE TINY SPOT on your chip, and the chip is only one part of your card that can get too hot and possibly cause artifacting ... the VRMS and memory chip's can also overheat ... and you have no way to monitor their temps on Fermi cards

But raising volts is certainly worth a try anyways.

While generally speaking more volts = higher OC ability, there still is a 'hard limit' to how high the card can OC. IOW at a certain point adding volts ceases to allow increasing clocks. This limit can be slightly circumvented by using h2o cooling and even (sometimes significantly) more by use of extreme cooling solutions like LN2.

But eventually of course no matter what you do you'll hit a limit where adding more volts won't allow you to OC any higher, as the electrons will start jumping out of their traces and arcing out.

Lastly ... Kombustor/Furmark sucks IMHO. I run Heaven bench, maxed at 1024x768 in Windowed mode while I adjust clocks/volts. It's pretty reliable in terms of either artifacting, crashing out, or developing stutters whenever the clocks are set too high.

Once I establish my clocks/volts in this way, I usually then subject the OC to loops of full-screen Heaven, 3dMark11, and Crysis. If the OC holds up with these 3 tests, 99% of the time it's a stable OC.
    
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