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8GB or 16 GB Garfic memory - 2x 1080 SLI

Discussion in 'Videocards - NVIDIA GeForce' started by Anna9, Jan 7, 2019.

  1. Anna9

    Anna9 New Member

    Messages:
    3
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    GPU:
    nVidia 1080 SLI 2x
    Hi
    Do I have 8GB or 16GB, I have this laptop with 2x nVidia 1080 SLI enabled.

    Intel extreme tuning utility says that I have 4gb each.
    GPU-z says that I have 8GB
    nVidia control panel says I have 8GB each.

    But in process explorer and all apps say that I have only 8gb VGA memory available!

    Report on NVIDIA's system information

    [Screen]
    Operating system: Windows 10 Home, 64-bit
    DirectX version: 12.0
    GPU Device Processor: GeForce GTX 1080
    Driver Version: 417.58
    Driver Type: Standard
    Direct3D API version: 12
    Direct3D function level: 12_1
    CUDA cores: 2560
    Nuclear clock: 1556 MHz
    Memory Data Rate: 10.01 Gbps
    Memory interface: 256 bits
    Memory bandwidth: 320.32 GB / s
    Total available graphics memory: 40939 MB
    Dedicated video memory: 8192 MB GDDR5X
    System Video Memory: 0 MB
    Shared system memory: 32747 MB
    Video BIOS version: 86.04.31.00.03
    IRQ: Not used
    Bus: PCI Express x8 Gen3
    Unit ID: 10DE 1BA0 11AE1462
    Article number: 2915 0010
    GPU Device Processor: GeForce GTX 1080
    Driver Version: 417.58
    Driver Type: Standard
    Direct3D API version: 12
    Direct3D function level: 12_1
    CUDA cores: 2560
    Nuclear clock: 1556 MHz
    Memory Data Rate: 10.01 Gbps
    Memory interface: 256 bits
    Memory bandwidth: 320.32 GB / s
    Total available graphics memory: 40939 MB
    Dedicated video memory: 8192 MB GDDR5X
    System Video Memory: 0 MB
    Shared system memory: 32747 MB
    Video BIOS version: 86.04.31.00.03
    IRQ: Not used
    Bus: PCI Express x8 Gen3
    Unit ID: 10DE 1BA0 11AE1462
    Article number: 2915 0010

    [Components]

    nvui.dll 8.17.14.1758 NVIDIA User Experience Driver Component
    nvxdplcy.dll 8.17.14.1758 NVIDIA User Experience Driver Component
    nvxdbat.dll 8.17.14.1758 NVIDIA User Experience Driver Component
    nvxdapix.dll 8.17.14.1758 NVIDIA User Experience Driver Component
    NVCPL.DLL 8.17.14.1758 NVIDIA User Experience Driver Component
    nvCplUIR.dll 8.1.940.0 NVIDIA Control Panel
    nvCplUI.exe 8.1.940.0 NVIDIA Control Panel
    nvViTvSR.dll 25.21.14.1758 NVIDIA Video Server
    nvViTvS.dll 25.21.14.1758 NVIDIA Video Server
    NVSTVIEW.EXE 7.17.14.1758 NVIDIA 3D Vision Photo Viewer
    NVSTTEST.EXE 7.17.14.1758 NVIDIA 3D Vision Test Application
    NVSTRES.DLL 7.17.14.1758 NVIDIA 3D Vision Module
    nvDispSR.dll 25.21.14.1758 NVIDIA Display Server
    NVMCTRAY.DLL 25.21.14.1758 NVIDIA Media Center Library
    nvDispS.dll 25.21.14.1758 NVIDIA Display Server
    nvWSSR.dll 25.21.14.1758 NVIDIA Workstation Server
    nvWSS.dll 25.21.14.1758 NVIDIA Workstation Server
    PhysX 09.18.0907 NVIDIA PhysX
    NVCUDA.DLL 25.21.14.1758 NVIDIA CUDA 10.0.132 driver
    nvGameSR.dll 25.21.14.1758 NVIDIA 3D Settings Server
    nvGameS.dll 25.21.14.1758 NVIDIA 3D Settings Server

    I have been watching my other card inactive the whole time although I played games with SLI enabled. Please note that SLI is enabled in nVidia control panel.

    How to test the 2 nVidia working simultaneously?

    If I have 16GB, how do I make it enabled to windows apps?
     
    Last edited by a moderator: Jan 7, 2019
  2. fantaskarsef

    fantaskarsef Ancient Guru

    Messages:
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    GPU:
    1080Ti @h2o
    In truth you only have 8GB of usable VRAM. SLI does not work with combined memory pools, unfortunately.
    In theory they could go down further and indeed combine the VRAM (NVlink), but that's reserved to the newest cards and professional environments, iirc. For gaming purposes (SLI and CFX for AMD too), you can't share VRAM between cards.
     
    Anna9 likes this.
  3. Anna9

    Anna9 New Member

    Messages:
    3
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    GPU:
    nVidia 1080 SLI 2x
    Do you mean I have 8GB each and I can only use 8GB?

    Is it possible for games to use the 16GB?

    But why Intel extreme tuning utility says that I have 4gb each? https://imgur.com/a/8WdYm6t
     
  4. fantaskarsef

    fantaskarsef Ancient Guru

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    GPU:
    1080Ti @h2o
    You cards phsyically have 2x 8GB with reduced memory bandwidth I think. So physically, you might have 16GB.
    But SLI itself does not duplicate the VRAM, that's not how it works unfortunately (and hasn't done so for any multi GPU solution in the real world so far). So no, games will never use the 16GB of VRAM, only 8 for the purposes of frame buffering etc.

    Intel's utility probably only knows that your cards have 8GB, run in SLI, and thus don't have more than 8GB of VRAM usable (again, it's a SLI limitation). So they think they need to devide it by 2, hence it shows 4GB. Only way I can imagine it shows 4GB / card.
     
    Anna9 likes this.

  5. Zooke

    Zooke Member Guru

    Messages:
    179
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    20
    GPU:
    Titan X SLI @ 1475
    Its a bit like having 2 wheels on your bike, you definitely have 2 wheels but you can't use 1 wheel to go north and 1 wheel to go south at the same time.
     
    yasamoka, Anna9, The1 and 1 other person like this.
  6. Anna9

    Anna9 New Member

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    3
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    GPU:
    nVidia 1080 SLI 2x
    Thanks for the replies :)

    I guess GTA 5 says 16gb. so maybe some games can use the whole 16GB with SLI!
     
  7. lmimmfn

    lmimmfn Ancient Guru

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    GPU:
    AorusXtreme 1080Ti
    no, for gaming the data is essentially duplicated in each GPU with 1 GPU rendering odd frames and the other rendering even frames. So its not 16GB as the same data must be in each of the GPUs.

    GTA has always been awful at reporting total VRam for SLI/Crossfire setups, GTAIV was the same.
     
  8. fantaskarsef

    fantaskarsef Ancient Guru

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    GPU:
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    This. GTA shows 16GB, but the way SLI works itself, it does not really double your capacity, unfortunetly.
     
  9. SteveJ12

    SteveJ12 Member

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    11
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    GPU:
    Nvdia 1080ti
    You have 8gb of VRam. This same things also show in my laptop. I have 1gb of amd graphic in my laptop and my computer properties shows that my laptop has 4gb of available graphic memory
     
  10. fantaskarsef

    fantaskarsef Ancient Guru

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    GPU:
    1080Ti @h2o
    Well, the thing with AMD graphics in latops is, you might have 4GB shared memory from the system RAM. Could that be? It's like that on my HTPC, where it shares the 16GB system RAM with the iGPU.
     

  11. Mannerheim

    Mannerheim Ancient Guru

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    GPU:
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    3dfx was ahead of its time. doubled memory buffer with SLI
     
  12. BlackZero

    BlackZero Ancient Guru

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    GPU:
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  13. yasamoka

    yasamoka Ancient Guru

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    GPU:
    EVGA GTX 1080Ti SC
    Not AFR. AFR requires the same resources to be loaded into both GPUs to work.

    Both AFR and SFR require VRAM contents to be duplicated otherwise each GPU would have to fetch the one set of resources every other frame. Had it been possible for that to happen and for a frame to be rendered in time after all of that, GPUs wouldn't be equipped with VRAM to begin with, and all resources would simply be dumped into RAM. No amount of complexity can get over this limitation unless GPUs have a very high throughput, (relatively) low-latency link between them that allows each GPU to access the other GPU's VRAM pool.
     
  14. BlackZero

    BlackZero Ancient Guru

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    GPU:
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    We are discussing VRAM mirroring.

    That’s got nothing to do with requiring high bandwidth memory being present on a card.
     
  15. Dagda

    Dagda Member Guru

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    GPU:
    GTX 1080ti/rtx 2070
    lol i read garlic memory
     

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