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Will unreal engine 5 make use of a multi gpu setup?

milliethegreatmilliethegreat Posts: 410
in Unreal Discussion

If I have two Nvidia gpus with the latest studio drivers (Titan xp and Titan x pascal) will unreal engine 5.3 use both or will I be wasting my money on the second GPU?

Comments

  • Jay VersluisJay Versluis Posts: 262

    I don't think UE uses multiple GPUs, at least not as of version 5.3. When I had multiple GPUs in my system, only the first/primary was used while the other one was sitting idle.

  • milliethegreatmilliethegreat Posts: 410

    So it ended in 5.3 or after? I'm a bit confused. I usually don't use anything below 5.3 for large scenes. I don't think assets are backwards compatible so I can't bump back to 5.2 for those scenes and for my 5.2 and earlier scenes there's no point. They're too small. It'd be nice to have 48gb vram instead of 24gb vram for 5.3

  • milliethegreatmilliethegreat Posts: 410

    I looked it up on Microsoft edge and the copilot ai thingy says yes 5.3 does support it but not anything newer. I don't trust copilot but maybe I'm wrong?

  • milliethegreatmilliethegreat Posts: 410

    I use nvlink dual gpus for Daz I just thought I'd use it for UE as a bonus 

  • Richard HaseltineRichard Haseltine Posts: 107,857

    Don't trust AI replies unless they link to credibly informed pages that confirm what they give.

  • milliethegreatmilliethegreat Posts: 410

    Oh trust me I don't! That's why I'm doing a bit of digging around online for further information. It's a bit of information overload but I'm learning a few random things I find interesting along the way.

  • hardwire666hardwire666 Posts: 74

    From what I can find the feature of multi-GPU rendering using the Pathtracer was experimental, and has been disable in the sourcecode. Meaning it will likekly be compleatly removed at some point. Outside of the pathtracer you would've use SLI which is loooooooooooooooong since depriacted.

    Short answer - It was killed.
    Long answer - It was killed becasue it didn't work well.

  • milliethegreatmilliethegreat Posts: 410

    That's a pain in the neck. 24gb vram is enough for most scenes I do (even after my other background tasks eat about 7gb vram for some unknown godforsaken reason) but I'd rather have more if i could. And no getting a different gpu is NOT an option so DO NOT suggest that! I mean I'd like the option to have bigger or more detailed scenes but i seem to be out of luck at this point unless there's a a different option that isn't fiddling with editing textures or something garbage like that that envolves hyper advanced experience in computer graphics. Any suggestions?

  • milliethegreatmilliethegreat Posts: 410

    Is there ANY option for larger scenes that doesnt envolve buying a new gpu or something like that? i have a pair of Nvidia Titan RTX's. i bought 2 primarily for Daz. anything way i can i can do larger scenes with them??? i REEEEEEEEEEEALLY don't want to buy another gpu. nor can i.

  • milliethegreatmilliethegreat Posts: 410

    I found this in my quick research on google but i don't think it helps my scenerio as it seems from a quick glance it helps render scenes faster NOT render larger more detailed scenes.

    Multi-Process Rendering with Unreal Engine | Unreal Engine 5.6 Documentation | Epic Developer Community

    is there not any way to do what im trying to do? i mean id imagine even if you were to have an entire computer stuffed with 5090s or something and mlti gpu was scrapped there'd be SOME way to do larger scenes. its not like theres a 512gb vram gpu outside datacenters if at all and id imagine im not the only person in dealing with this issue. i mean there's gotta be a way THERES GOTTA!!! please help!!!!

  • Richard HaseltineRichard Haseltine Posts: 107,857
    edited September 25

    Is this about Unreal or DS? You are in the Unreal forum but a lot of your  questions are about DS (in which part of the answer would be optimise your scenes - lower division levels and map sizes on more dsitant figures, remove maps on entirely hidden body parts, use Instances if possible).

    In DS multiple GPUs don't necessarily help - if they support nvLink they can pool memory for materials, but otherwise they work independently.

    Post edited by Richard Haseltine on
  • milliethegreatmilliethegreat Posts: 410

    as far as DS doesn;t pooling memory for materials actually help. id imaging that;s the biggest offender but i really don't know. but as the tital says its an ureal engine question as i saw you have an unreal section. i didn't know until literally just now the unreal engine's forums are open to anyone. i thought it was only for epic devs and asset/plugin devs. i just posted my question there too also i don't know how to lower division levels or map sizes removing maps using estances or optimising scenes and stuff like that. i don't usually have issues with DS but like i said im not a professional graphics designer as i keep telling you all numerous times now. also like i said this post is about unreal

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