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GTX 680 SLI Overclocking

post #1 of 10
7/16/12 at 12:24am
Thread Starter 
Hello,

I have been trying to get a stable overclock on my GTX 680 4GB SLI fo the last few days now.

Card1 boosts to max 1110, and card2 to boosts to max 1071.
For so far im kinda dissapointed in the overclocking of these cards.

Im currently stressing with Heaven at +130/+120, The cards crashes when i run +150..

However the second card is never running the same speed as the first card..? i know the second card has a lower boost, but cmon.. i have been running SLI since the 9800GTX and i never had these issues before.

what also happens is when i OC and stress in heaven, around +140/+140, the GPU usage on the second card drops to 50/60% which gives me a big fps loss.

I don't understand it anymore :s
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post #2 of 10
7/16/12 at 12:32am
Theyre most likely unstable OC's. Prolly also got some bad OCers.
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post #3 of 10
7/16/12 at 12:41am
Thread Starter 
I actually haven't touched the Voltages yet, as im seeing it goes automatically.

should i?
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post #4 of 10
7/16/12 at 12:58am
Quote:
Originally Posted by Equinoxe View Post

I actually haven't touched the Voltages yet, as im seeing it goes automatically.

should i?

So you can control voltages? Yeah up them a bit.
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post #5 of 10
7/16/12 at 1:08am
Thread Starter 
Yes i can control it in evga precision , max 1175mv.
But i doubt if it would give me better stability since i see that the voltages automatically adjust to the clock speeds.
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post #6 of 10
7/16/12 at 1:39am
Quote:
Originally Posted by Equinoxe View Post

Yes i can control it in evga precision , max 1175mv.
But i doubt if it would give me better stability since i see that the voltages automatically adjust to the clock speeds.

Is the temp too high? Your card could be overheating. It could also be giving it too low of a voltage or too high of a voltage on auto. (if I seem slow or missing something its 3:40 AM here so I am dead tired)
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post #7 of 10
7/16/12 at 1:43am
Thread Starter 
Temps are all fine.. With a custom fancurve the first card never goes over 70c and the second card never goes over 65c.
I have forced the voltage to 1175.
Im testing it at the moment.
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post #8 of 10
7/16/12 at 1:44am
Okay but pushing the voltage to the max probably isn't the best idea. Try only a couple notches.
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post #9 of 10
7/16/12 at 3:15am
Thread Starter 
According to evga forums its fine to run 1175mv forced.
These cards work very different compared to fermi. The boost clocks makes it quite complicated imo lol.
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post #10 of 10
7/16/12 at 9:06am
Don't force the voltages. If the card has a reference design (even though its 4gb) then the voltages will automatically set themselves. Try overclocking the cards individually and see which one is dragging you back.
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