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2x GTX 680's - Not recognizing 2nd card.

post #1 of 13
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Received two MSI GTX 680's today and set them up. I tested one of them on it's own and it worked just fine. Switched motherboards, and set up both of them. Attached the SLI bridge in the same spot as in this picture (from the web.)

muexvn.jpg

I had a 5970 before which was two GPU's obviously, but I have never used an SLI bridge before or had two seperate graphics cards. Did I miss something?
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post #2 of 13
Did you enable SLI in the drivers?
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post #3 of 13
reinstall the drivers...it should show up then..i had the same issue a few hours ago
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post #4 of 13
Clean reinstall and be sure your bridge is securely in place. Be sure to enable sli in NVIDIA control panel. Sounds silly, but I've made that mistake before.

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post #5 of 13
Thread Starter 
Ok, I really don't get this. I have had problems with shotty PCI-e slots on two mobos now. My 2nd PCI-e slot is not recognizing any card in there. The first PCI-e slot on my other mobo did this exact same thing.

I just removed the first gtx 680 from the first slot. Tried running with 2nd gtx 680 from the 2nd pci-e slot on its own. Nothing shown in device manager, 640x480 res when I get to desktop.

Moved 2nd gtx 680 to first PCI-e slot, everything works perfectly.

I don't get it, two boards can't have this exact same problem...
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post #6 of 13
Thread Starter 
*sigh* what a weird issue to have recurring on two motherboards....

I am in disbelief that this is even possible.

I put the card in the 3rd PCI-e slot and it is recognized.

Is the 2nd PCI-e slot busted? The first PCI-e slot on my other mobo that I replaced recently did not recognize any graphics cards on it either.... which is one of the reason I replaced it with the used evga x58 from this website after Asus' horrible customer support refused to repair my motherboard after RMA'ing it twice. Sorry if it sounds like im complaining, i've heard of people ordering 3+ new mobos from newegg and them all being DoA, but this chews.

This is the motherboard I am using now: http://www.newegg.com/Product/Product.aspx?Item=N82E16813188039 - EVGA 3-way SLI

Can I still run the 3rd PCI-e slot in x16 mode? I don't think you can..... mad.gif

I read somewhere I believe that x16 and x8 aren't that big of a difference, but it says in the manual that came with the gtx 680 to hook it up to a pci-e x16. Can it be run in x8, if so, will there be a performance drop?
Edited by Peteman990 - 4/20/12 at 9:29pm
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post #7 of 13
Quote:
Originally Posted by Peteman990 View Post

*sigh* what a weird issue to have recurring on two motherboards....
I am in disbelief that this is even possible.
I put the card in the 3rd PCI-e slot and it is recognized.
Is the 2nd PCI-e slot busted? The first PCI-e slot on my other mobo that I replaced recently did not recognize any graphics cards on it either.
This is the motherboard I am using now: http://www.newegg.com/Product/Product.aspx?Item=N82E16813188039 - EVGA 3-way SLI
Can I still run the 3rd PCI-e slot in x16 mode? I don't think you can..... mad.gif

you should still be able to run sli, but I don't think it will be 16x on both slots, more than likely it will be 8x, but you wont notice much (if any) performance difference between them.
 
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post #8 of 13
2-5% performance hit on 580's. 680 may be more significant since they are more powerful, but the difference will be minimal.

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post #9 of 13
Thread Starter 
Yeah it won't be x16 on the 3rd slot I know, but what is the difference between x16 and x8 if there is no performance difference? Disappointing to have this problem with two motherboards and definitely don't have the budget to get a new mobo now that I spent over $1000 on these two babies, but I guess these kinds of issues happen sometimes.. bad luck I suppose thinking.gif
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post #10 of 13
Thread Starter 
Look at this video. He runs four tests. This is with 2x GTX 680's in SLI.

1) PCIe 2.0 x8/x8 4xMSAA
2) PCIe 2.0 x8/x8 8xMSAA
3) PCIe 2.0 x16/x16 4xMSAA
4) PCIe 2.0 x16/x16 8xMSAA

Skip to 3:11 for results of test 1. Skip to 9:24 for results of test 3. About 5fps more max fps with the x16 lanes than the x8. Slightly lower score and fps with the x8 lanes, but as you said isn't a HUGE difference. And I had cleaned out every portion of my computer and re-applied paste hoping it'd be like brand new, seeing that the newer mobo I got OC's my 920 to 4ghz instead of a failing 3.4ghz on my Asus mobo. Gotta pick up a longer SLI bridge.... hopefully Microcenter has one. Interesting results though, qualms my fears a- bit of reduced performance I suppose I can live with it for 8 more months or so when I will be eligible for some upgrades to Ivy and beyond.

Edit: No way! Microcenter actually has a SLI bridge that looks like it will be long enough...(http://www.microcenter.com/single_product_results.phtml?product_id=0379307) haha! I love that store, saves shipping costs and has just about anything computer accessory you need and it's only 10 minutes away. Disappointment followed by a pleasant relief. Can't wait to test em out tomorrow...
Edited by Peteman990 - 4/20/12 at 9:51pm
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