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A (different) multiple GPU question

conflatedconflated Posts: 9
in Technical Help (nuts n bolts)

I'm looking to build a new system with multiple GPUs. I was wondering if it would be beneficial to drive my displays from the integrated Intel GPU and reserve the beefy cards only for GPU acceleration work. Does anyone have an opinion on how much benefit, if any, that would provide when it comes to rendering times?

Comments

  • Richard HaseltineRichard Haseltine Posts: 102,701

    DS doesn't work well with at least some Intel GPUs

  • kenshaw011267kenshaw011267 Posts: 3,805

    If you are not buying quadros there is no point. Windows reserves some memory on every GPU that has active video outs they don't need to be connected to a monitor at all. Quadros can be put into a mode that shuts off the visdeo outs and windows gives access to the full memory but, of course, you can't then use the card for a monitor without changing modes.

  • RurisRuris Posts: 123

    I got a similar experience to share: I got a dual 1080. And yes if GPUz can be trusted, if you use one of it as display it will consume like 500mb as display. Switching in BIOS to use the generic Intel gpu is fine, it doesnt cause any bugs but the viewport will have slowdown. Not worth the trouble, since I do some gaming as well, and the 500mb saved is not that much if your card is 8gb.

  • conflatedconflated Posts: 9
    kenshaw011267 said:

    If you are not buying quadros there is no point. Windows reserves some memory on every GPU that has active video outs they don't need to be connected to a monitor at all. Quadros can be put into a mode that shuts off the visdeo outs and windows gives access to the full memory but, of course, you can't then use the card for a monitor without changing modes.

    Thank you for this info. Led me down a path to reading about TCC vs WDDM (https://docs.nvidia.com/gameworks/content/developertools/desktop/nsight/tesla_compute_cluster.htm), and which cards support TCC. As you indicated, the professional cards support TCC, and GeForce generally does not. e.g. https://devtalk.nvidia.com/default/topic/961020/is-gtx1080-compatible-with-tcc-mode-/ ; and   https://www.pugetsystems.com/labs/articles/NVLink-on-NVIDIA-GeForce-RTX-2080-2080-Ti-in-Windows-10-1253/

    For anyone else interested, searching for TCC on these forums finds some additional discussion.

  • conflatedconflated Posts: 9
    Richard Haseltine said:

    DS doesn't work well with at least some Intel GPUs

    Thank you for mentioning this. Do you know if Intel UHD Graphics 630 works well with DS? I would be using the Intel GPU only to drive the displays. As a fallback I could always just plug the displays into one of the Nvidia cards.

  • Richard HaseltineRichard Haseltine Posts: 102,701
    conflated said:
    Richard Haseltine said:

    DS doesn't work well with at least some Intel GPUs

    Thank you for mentioning this. Do you know if Intel UHD Graphics 630 works well with DS? I would be using the Intel GPU only to drive the displays. As a fallback I could always just plug the displays into one of the Nvidia cards.

    I don't, just that some people with GPUs on the CPU and stand-alone GPUs have had issues when the system has switched to using the GPU on the CPU for DS.

  • kenshaw011267kenshaw011267 Posts: 3,805

    The problem seems to be that when you setup a computer to work this way, sometimes DS gets set to use the iGPU rather than the Nvidia GPU for rendering. As far as I know this has always been resoved by opening the Nvidia control panel and manually setting DS to use the Nvidia GPU.

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