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Memory hungry scenes - is NVLink suppported? 2X3090 or single A6000

Discussion in 'HDRP Ray Tracing' started by newguy123, Jul 12, 2021.

  1. newguy123

    newguy123

    Joined:
    Aug 22, 2018
    Posts:
    1,248
    Hi Guys

    Is NVlink supported? We're trying to decide on new hardware and weighing up pros/cons of 2 X 3090 in NVlink, or a single A6000.

    Of course 2 X 3090 gives us 48GB, just like the A6000, but 2X3090 has plenty more CUDA and RT cores.
     
    newguy123, Jul 12, 2021
    #1

  2. INedelcu

    INedelcu

    Unity Technologies

    Joined:
    Jul 14, 2015
    Posts:
    173
    Hi!

    Unity Graphics doesn't support multi-GPU setups unfortunately.
     
    INedelcu, Jul 12, 2021
    #2

  3. newguy123

    newguy123

    Joined:
    Aug 22, 2018
    Posts:
    1,248
    Such a pity!

    On smaller scenes, 2X3090 should perform almost twice as fast as a single A6000.

    However, since Unity only supports a single GPU, then that makes the A6000 the winner I suppose since on smaller scenes a single 3090 will be marginally faster (maybe 1%) than a A6000, whereas on larger scenes the A6000 will outperform the 3090 by a LOT since it can handle way larger scenes!

    Are there any plans on the roadmap to support multiple GPU setups or setups with NVlink?
     
    newguy123, Jul 12, 2021
    #3

  4. INedelcu

    INedelcu

    Unity Technologies

    Joined:
    Jul 14, 2015
    Posts:
    173
    There's nothing in the roadmap as far as I know. There are multiple reasons for this. The rendering backends need serious refactoring to support multiple GPUs (command buffer management and execution, memory allocation, etc.), the testing infrastructure needs to have such setups to make sure it will work in the future and the developers and testers also need to have such setups and test the features they are working on. I don't know for sure but I assume a very tiny amount of users have such system which will probably result in a very tiny priority against every other feature.
     
    INedelcu, Jul 12, 2021
    #4
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