1 slot SLI bridges... what's going on???

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Joe Doe

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I need a 1 slot spacing SLI bridge for two GTX 1080 Ti's. The only thing available are 2, 3, or 4 slot... even though 1 slot seems the most common, it's not only extremely rare now, but even saying "discontinued". These are brand new, high end MBs still using this spacing.

What is going on here?
 
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kerberos_20
nvidia-hb-sli-bridges.jpg

btw current hb bridge
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Joe Doe

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Not according to everything I've seen... and if that where true, how could there be any such thing as a "0" slot or "1" slot sli bridge, which I see available from many difference sources and manufacturers? "0" would then mean no video card and a single video card would take at least one slot in your scenario, which would make the need for sli or a bridge nonexistent.

The slot spacing refers to the amount of slots left between the installed cards.

 
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Joe Doe

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All the charts I saw were like the pic of the chart I posted above. If there are different standards as seen in the other pic, than I suppose I’ll continue trying to find one that fits, with the next attempt being a “3 slot”. I wish they wouldn't do that kind of stuff.

I already used the bridge included with the motherboard, and it was the correct spacing, but when booted up, the computer doesn’t recognize both cards, and the fans stop turning on the one the HDMI cable is plugged into, but are still turning on the other one.
 
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4745454b

4745454b

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The 10xx uses the new HB SLI bridge. I'm guessing the one that came with the board was an older normal bandwidth bridge.

Which board are you using? I'm surprised this is happening. Maybe there is more space between the slots you should be using.
 
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Joe Doe

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that doesnt seems to be issue with sli bridge
without that bridge both cards are detectable?
Click to expand...

I just checked. Doesn’t seem to be.

Same behavior… both GPU power on with fans when system turned on, when OS boots the fans on the card with HDMI pugged stops turning, and the other one is still turning. If I were to take the HDMI out of the one that doesn’t spin and put it in the one that does, there’s no video signal.

Nvidia control panel shows only one GTX 1080 Ti in the pulldown on “Configure Surround”.

DxDiag and the device manager shows only one instance as well.


Specs:

MB = Asus Maximus X Hero Z370
CPU= i7 8700k
GPU= Two Gigabyte GeForce GTX 1080 Ti OC 11GB GDDR5X
PSU= Corsair AX 1200i
HD= 2TB Samsung 970 Evo M.2 nvme
RAM= 64g Corsair Vengeance LPX DDR4
OS= Win 10 current build
 
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Joe Doe

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Yes, all cables were hooked up. I just tried switching the cards around... exact same behavior. Same GPU fan behavior after OS load (except the one that used to spin doesn't because they switched places), same lack of multiple instances in GeForce control panel, DxDiag, etc.

Each card works if installed only by itself as well, and if running a single card, the fans spin.

 
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Joe Doe

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I bought an Nvidia SLI bridge that fit yesterday. Installed, bridge lights up and everything. Same behavior from the cards.

Seeing as how they’re being recognized in BIOS, and that they each work individually if installed as a single card, and that the behavior switches when cards are switched around… is this somehow how things are supposed to be in windows now? I don’t understand how you wouldn’t have the two display tabs in dxdiag.

Should a different thread be started for this problem?
 
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Rogue Leader

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I think the reason you aren't seeing the second card is because of the SLI bridge. Theres a couple things. First the bottom card in SLI when not being actively used will power off (fans won't spin) this is a power saving feature. Secondly have you gone into Nvidia control panel and tried to enable SLI? Its possible the reason you don't see both cards is because you have the SLI bridge installed. If you removed it and booted the system you'd probably see them, but with it connected the cards will not operate independently.

Check device manager as well to see if its there, check all your cables and connections too. If none of this is an issue and SLI will not enable, then my friend you need to RMA your motherboard. SLI is fairly simple one of those things that should "just work" if it doesn't, there is a hardware issue.
 
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Rogue Leader

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MERGED QUESTION
Question from Joe Doe : "SLI Build Doesn't Seem to Recognize Both Cards"









 
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Rogue Leader

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That is not correct. M.2 Drives run off the PCH PCIe lanes on an Intel board. The GPUs take all 16 CPU PCIe lanes. His BIOS even says both cards are running at x8 taking those lanes.
 
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