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Question about SLI (2 different GTX 670s)

post #1 of 17
Thread Starter 
So I feel extremely foolish. When I purchased the components for my new build, I rather hastily chose the generic but "Superclocked" version of the GTX 670 from EVGA. Possibly because the FTW model wasn't out yet, but my plan was to one day purchase a second one of the card I bought initially to run it in SLI when it becomes antiquated. Long story short, can these two cards be run effectively in SLI? They have the same amount of cores, same amount of memory, same memory type/interface and same memory clock. The only thing different is the core clocks both standard and overclocked. Thank you in advance.
post #2 of 17
Yes you can SLI them. tongue.gif

I am just so nit-picky about it, I have to have almost the exact same GPU, I had different GTX 570s when I SLI'd them and it drove me nuts xD
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post #3 of 17
Hello there! First off, congrats on getting a GTX 670. It's a great card that will serve you well.

Nvidia's SLI specifications state that any card of the same model can SLI with another card of that model. That means that any GTX 680 can SLI with any other 680, or any 670 with any 670. If there's a difference in Core clock, the faster card will down-clock to the same level as the slower card to match it. In short, you'll be fine. thumb.gif
 
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post #4 of 17
Thread Starter 
So even though the FTW model comes with a few more gadgets and software gizmos, it would essentially just become the generic version I have anyway if I SLI them?
post #5 of 17
The GPU is the important aspect. Memory and clocks will default to the slower card smile.gif
Doesn't care if one card is pink and the other blue with a 5 slot cooler on it.
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post #6 of 17
Quote:
Originally Posted by Bombadil411 View Post

So even though the FTW model comes with a few more gadgets and software gizmos, it would essentially just become the generic version I have anyway if I SLI them?

yeah it's nothing that special, you can still SLI them tongue.gif
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post #7 of 17
Quote:
Originally Posted by Bombadil411 View Post

So even though the FTW model comes with a few more gadgets and software gizmos, it would essentially just become the generic version I have anyway if I SLI them?

You can always use an overclocking software for them to run at the same speeds, such as Evga precision.
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post #8 of 17
Thread Starter 
Quote:
Originally Posted by IBooNI View Post

You can always use an overclocking software for them to run at the same speeds, such as Evga precision.

The same speeds as one another I'm assuming? Or the same speeds that they're each individually capable of?

Thank you everyone, I really appreciate your help.
Edited by Bombadil411 - 10/26/12 at 12:53pm
post #9 of 17
If you get a FTW 670 it won't 'become' a generic 670 just by running it in SLI with a generic card. It still has the better (GTX680-sized) PCB, better cooler, better power section, etc. It will also run at whatever clocks it runs at from the factory, it will NOT downclock to the slower cards clocks. It'll also (I'd bet) maintain it's value better.

However, the two cards together in SLI will in most cases perform the same as having two cards at the lower of the two clocks. E.G. a 1050MHz card + 1100MHz card in SLI will usually perform like two 1050MHz cards ... what ends up happening is the faster card 'waits' for the slower card. So you'll see the 1050MHz card running at 99% usage, and the 1100MHz card running at 95% usage or thereabouts.

But whether or not this happens may depend on the game you're running. Some games in that scenario may perform like two cards at 1075MHz ... the average of the two. I can't say for sure that will happen with 670's cause I've not tested it, but I have seen card reviews done that showed an 'averaging' of performance between the two 'mismatched' cards in certain games, so I know it's possible for that to occur.

However, no matter what, both cards can be OC'd separately though using PrecisionX. It's very likely the generic card could be OC'd to the speed of the stock FTW, or perhaps even higher. If it were me, I wouldn't hesitate to grab an FTW as your 2nd card for SLI thumb.gif
    
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post #10 of 17
I would use msi afterburner and overclock them to the faster card specs, If you dont mind the heat. Bump volts on slower card.
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