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Scene Iray Vram consumption?

DiasporaDiaspora Posts: 454
in Technical Help (nuts n bolts)

How do I determine how much Vram my scene is consuming when I render in Iray?

I'm trying to figure out if I should make the leap and get the 24 gigabyte RTX 3090 or if the 10 gigabyte RTX 3080 is more than enough for my purposes.

I'm currently running an 8gb RTX 2080, so if I just try to indirectly measure vram consumption by overloading a scene, that doesn't really tell me how much more of a difference 10 gigabytes would make.

Comments

  • gniiialgniiial Posts: 211

    Try to think about the future. Which card would last longer? If money is not the matter...

    Render a scene then:
    Help -> Troubbleshooting -> Log file

    and there look for:
    IRAY:RENDER ::   1.15  IRAY   rend info : CUDA device 0 .... Allocated 1.688 GiB of work space

    IRAY:RENDER ::   1.15  IRAY   rend info : CUDA device 1 .... Allocated 1.688 GiB of work space

  • PerttiAPerttiA Posts: 10,024
    Diaspora said:

    How do I determine how much Vram my scene is consuming when I render in Iray?

    I'm trying to figure out if I should make the leap and get the 24 gigabyte RTX 3090 or if the 10 gigabyte RTX 3080 is more than enough for my purposes.

    I'm currently running an 8gb RTX 2080, so if I just try to indirectly measure vram consumption by overloading a scene, that doesn't really tell me how much more of a difference 10 gigabytes would make.

    Just stick to your RTX 2080 - Maybe in 6 months we have a better picture of RTX 30xx lineup.

  • DiasporaDiaspora Posts: 454

    Gniiial, I don't think that line actually means total vram consumption. 

    I tested it and all of my scenes return the same amount of work space allocation even though they vary wildly in the amount of textures and other data sent to the video card. I don't think that's the correct variable.  

  • JamesJABJamesJAB Posts: 1,760

    Open your task manager or system monitoring software of choice, and compare VRAM usage before and after hitting the render button and waiting for itterations start.

    Make sure viewport is set to someting other than Iray.
    VRAM used durring render - VRAM used before hitting render = Total Iray VRAM usage.

  • fastbike1fastbike1 Posts: 4,078

    @Diaspora

    GPU-Z is a popular way to monitor your GPU. Provides a wealth of useful information.

  • DiasporaDiaspora Posts: 454

    Thank you both for your replies, I heard of CPU-Z but not GPU-Z and I wasn't aware that Windows had a GPU Memory meter. Cheers!

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