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Problem overclocking SLI

post #1 of 7
Thread Starter 
Hello,

I've got two 7800 GTXs in SLI and am looking to overclock both. I'm using RivaTuner and figured out how you had to play with the NVIDIA display settings to make it recognize the second card with SLI turned off. This allows you to see the two seperate card configurations in RivaTuner and individually adjust the core/memory speed on both cards.

My problem is that as soon as I was done adjusting both cards, I turned SLI back on, started up RivaTuner and (expectedly) could no longer access the second card's configuration. This being the case, I figured RT would not be able to adjust the second card's speeds. Out of curiosity, I turned SLI back off and checked. Sure enough, RT showed that the second cards speeds had reverted back to stock.

Has anyone out there had success with keeping both cards in an SLI config at the same overclocked speeds? I've searched all over the web for an answer to this and could not find it.

Thanks!

GraveX
post #2 of 7
Check your drivers

http://nvidia.custhelp.com/cgi-bin/n...i=&p_topview=1
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post #3 of 7
Thread Starter 
Quote:
Originally Posted by GatorLCA
Thanks, I'm using 81.95, the latest and greatest. I can overclock using Coolbits, sure, but I seriously doubt that slider is adjusting both video cards in unison.

If it is, that's news to me, as "The Method" I've seen mentioned everywhere involved taking the system out of SLI to overclock each card individually.

I am starting to wonder if all of these people who did it like that really ended up just overclocking their main card and not both. Did they check? Because the second you put the system back into SLI mode, it seems to be resetting the clock/memory on the second card back to stock.

GraveX
post #4 of 7
Coolbits should be OC'ing both your cards at the same time if you have SLI enabled.
post #5 of 7
Thread Starter 
Quote:
Originally Posted by zerosniper0
Coolbits should be OC'ing both your cards at the same time if you have SLI enabled.
I just received an answer back from NVIDIA:

Customer12/03/2005 11:18 PM
Does using the overclocking feature in the Nvidia drivers set both cards to the same core and memory speed in an SLI configuration?

Response (MG)12/04/2005 12:34 AM
No it does not. In a way, this is a benefit as it does not limit the fastest card to the lowest common denominator. It sets each graphics card to the highest possible settings each card is capable of.

I'm not sure I even understand what he is saying there.

GraveX
post #6 of 7
Quote:
Originally Posted by GraveX
I just received an answer back from NVIDIA:

Customer 12/03/2005 11:18 PM
Does using the overclocking feature in the Nvidia drivers set both cards to the same core and memory speed in an SLI configuration?

Response (MG) 12/04/2005 12:34 AM
No it does not. In a way, this is a benefit as it does not limit the fastest card to the lowest common denominator. It sets each graphics card to the highest possible settings each card is capable of.

I'm not sure I even understand what he is saying there.

GraveX
I think he is talking about the auto-detect option in the drivers. My understanding is that when you set the Core/Memory MHz through Riva, it sets the freq the same on both cards when in SLI mode.
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post #7 of 7
Thread Starter 
Quote:
Originally Posted by Zeus
I think he is talking about the auto-detect option in the drivers. My understanding is that when you set the Core/Memory MHz through Riva, it sets the freq the same on both cards when in SLI mode.
Yeah, that's looking to be the case. Cool. Thanks for the reply.

GraveX
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