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I am working on an art project using Unity 2018.2 which will be run on a special setup of M6000 NVidia Quadro cards, each having 12GB of VRAM. My test computer has 2x NVidia 1070 Ti cards each with 8GB of VRAM. With Task Manager open to the GPU tab, I have "Dedicated GPU memory", "GPU Memory" and "Shared GPU memory" as shown here:

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The problem is, I have 8GB and Windows is reserving ~700MB which I can't seem to use. Can I change some setting in Windows to allow this memory to be used? In Advanced System Settings > Performance I disabled most Visual Effects:

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What is the "GPU Memory" which says 40GB total? Can I access this or tell Unity to somehow access it? Can I use VRAM from my other card which is doing nothing?

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  • "Shared GPU Memory" is just your system RAM so if you start using it then you will likely notice severe performance issues. Not sure if your familiar with RAM swapping to disk but it's the same idea.
    – MonkeyZeus
    Commented Aug 30, 2018 at 17:24
  • I have 64GB of RAM and when I took that screenshot, about 32GB was free. I wouldn't mind allocating 8-16GB for GPU... but how? I have 2133Mhz DDR4 DRAM with data transfer rate of ~17 GB/s compared to GDDR5 with ~256 GB/s (GPU-Z reading) so yeah a LOT slower but still possibly better than continuously swapping textures in/out of my program?
    – glenneroo
    Commented Aug 30, 2018 at 19:29
  • According to your screenshot, you have 32 GB reserved for your GPU to use as swap RAM. My assumption is that the GPU driver will perform the swapping when needed so forcing the GPU to use system RAM is not advisable. I believe that using system RAM as VRAM will actually cause the performance to slow down to the speeds of the slowest component which would be the system RAM. In layman's terms you would lose 80% performance from your GPU.
    – MonkeyZeus
    Commented Aug 30, 2018 at 19:38
  • According to the forums, there is no way to use your second GPU to magically boost performance. forum.unity.com/threads/…
    – MonkeyZeus
    Commented Aug 30, 2018 at 19:41
  • Why do you need more VRAM? Are you experiencing performance issues?
    – MonkeyZeus
    Commented Aug 30, 2018 at 19:41

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