Nvidia kills 3x and 4x SLI with Pascal *spawn*

Discussion in 'Architecture and Products' started by CSI PC, May 12, 2016.

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  1. CSI PC

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    There is a firmware key one can apply for to unlock beyond 2xHB SLI.
    I do wonder if the same firmware key is required for the standard 2xSLI (not 3/4).... Yeah logically this would be stupid to run for work/games but from a technical perspective will be interesting to know whether it requires a firmware to change operation between HB and traditional SLI.
    Point would be to prove whether the key is just an unlock or actual technical framing-signalling difference also done with the firmware.

    Cheers
     
  2. Alessio1989

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    So, 2-way with new bridges only, and that's the 2x bandwidth. Did I win a cake? :)
     
  3. Alexko

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    Honestly, if NVIDIA did kill 3/4-way SLI, I'd consider that a good thing. This kind of stuff probably requires a highly unreasonable amount of development effort that could be much better spent elsewhere.
     
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  4. Kaotik

    Kaotik Drunk Member
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    [​IMG]
     
  5. Clukos

    Clukos Bloodborne 2 when?
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    According to Jay 3/4 way Sli is still supported through a bios update



    But probably only usable for benchmarking
     
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  6. Alessio1989

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    The only unreasonable thing is the presence of the SLI bridges...
     
  7. Grall

    Grall Invisible Member
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    According to who? Who is that guy? Never heard of him before AFAIK, am I to treat him as an authority on the subject? :)
     
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  8. Kaotik

    Kaotik Drunk Member
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    Don't know about his sources, but according to NVIDIA those modes are still supported, even though it takes extra steps
    That's from GTX 1080 whitepaper
     
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  9. Silent_Buddha

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    That reads a lot like,

    We're no longer going to be putting in any driver development work into 3 or 4 way SLI. We realize that some people may still want to use it regardless of this, so we'll give you a way to enable it. Good Luck. It may still provide some level of scaling, possibly even good scaling, but don't hold your breath.

    IMO, a prudent and practical thing to do. Scaling beyond 2 cards tends to fall off quite rapidly in the vast majority of cases anyway. As well, the future of multi-GPU isn't SLI, IMO, but instead developers implementing in their engine something that works best for their game or using a middle-ware engine that provide MGPU support. I imagine Nvidia will hang onto SLI bridges and whatnot for as long as they can, but it'll hopefully die at some point. Once AFR isn't the de-facto way to utilize multiple GPU's I may actually look into MGPU again.

    Regards,
    SB
     
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  10. Clukos

    Clukos Bloodborne 2 when?
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    Jay is a PC enthusiast that has been running tri-sli configuration on his rig for at least the past three generations of Nvidia GPUs, his source is Nvidia directly. He talks about the enthusiast key too. I expect game support to be just as good as previous tri/quad sli support (i.e. not great) but at least it can still be used for 3DMark and bragging rights, i guess :p
     
  11. Moloch

    Moloch God of Wicked Games
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    So AMD gets rid of multi-gpu bridges with XDMA crossfire with Hawaii and nVidia wants you to use both bridges for 2 gpus doubling the bandwidth available.
    Hmm.
     
  12. CarstenS

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    Makes sense, doesn't it? ;)
     
  13. Alessio1989

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    >50£$€ per bridge, yes it makes sense..
     
  14. Silent_Buddha

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    Don't forget that it'll also happily work on x4 PCIE lanes (x16 slot) whereas Nvidia requires at least x8, I believe, AND still requires the SLI bridges.

    Regards,
    SB
     
  15. ToTTenTranz

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    While presenting better scalability in general.
     
  16. hughJ

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    Has there ever been any benchmarks for GPU to GPU copying for SLI vs crossfire, bridge vs no bridge, etc? When VR-SLI first went into beta there were some community tests that seemed to show the inter-card bandwidth could be taxed as the eye buffer size scaled up (8x/8x vs 16x/16x SLI seemed to produce noticeable performance differences as the buffers got larger). With VR every millisecond accounts for ~11% of your total available frame time, so it's much more bandwidth sensitive than a heavily pipeline AFR mode.
     
  17. CarstenS

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    Inter-card bandwidth is not about 3DMark scores or doubling Fps rates, but for direct and low-latency communication between the display engines, i.e. to achieve low-variance frametimes.
     
  18. pharma

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    Comment from PCPer on 3/4-Way SLI on Pascal ...

    http://www.pcper.com/news/Graphics-Cards/GeForce-GTX-1080-and-1070-3-Way-and-4-Way-SLI-will-not-be-enabled-games
     
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  19. BRiT

    BRiT (╯°□°)╯
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    So pretty much dead and killed except for benchmark wars.
     
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  20. pharma

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    What about multi-monitor?
     
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