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Windforce 670 X3 SLI

Snodge

Snodge

Snodge

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14 Apr 2012
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How would this work as every single Windforce has a different Boost clock, mine for example was at 1150 out of the box I overclocked it to 1215 but if I was to put a second card in there how would I overclock them to the same frequency if I was say to get a 1187mhz core clock on the second card? because then It'd be +65 core clock on each card making one card, 1215 and the other 1252 if that makes sense?

Anyone have any experience with this?
 
it applies to all 670s, not just winforces (in fact you could SLI you windforce with a non-windforce and get the same effect)

apparently it just works, the cards negotiate who is rendering what frames, though how much this plays in to some of the stutter issues some have been experiencing I'm not sure
 
illuz said:
Are you sure about that? Im sure evga prcision x allows you to sync the clocks?
Click to expand...

I thought this too but with my 680s for example, I set a +50mhz Offset and there is still about a 25Mhz difference between the cards. So what I've done to get both cards, running at the same speeds is un-ticked the sync box and clocked each card seperately. Seems to have worked so far...
 
When you have the second card in, open Presision X and make sure the sync box is unchecked then just adjust the sliders for each card.
 
The clock speeds in Precision X are synchronised by default, even if the cards themselves have different clock speeds. I have one regular card and a factory overclocked Windforce X3 in SLI. In order to match the speed I have to disable syncing and then manually overclock each card, making sure to check the GPU-Z speed to ensure they're the same. It's slightly more difficult than normal as the 6xx cards use overclocking offsets rather than set clock speeds. There are other differences between the cards as well - the Windforce doesn't let me set as high power offset and has a difference fan profile.

Use the monitor window to check that both cards scale up to the same clock speed - as long as they do you're good to go. I haven't noticed any issues from running each card at different speeds, so if you're off by a few MHz here or there then don't worry.
 
Azen said:
Thought they would go at the speed of the slowest?
Click to expand...

illuz said:
Are you sure about that? Im sure evga prcision x allows you to sync the clocks?
Click to expand...

this is true for previous generations of cards, but the 6xx series can run independent speeds

e.g. if you tick the sync box it uses the same offset, but the card itself controls the actual clocks being used, so even if you set the same offset on 2 cards, if they had different clock rates to start with they will still be different even if using sync

as TAC says, you can try to manually set the offset to keep the 2 near each other, but it doesn't seem to be neccessary or cause any problems having the 2 cards running different clocks
 
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