Multi-GPU Tutorial in Unreal Engine!

In this video, I'll show you how to set up Unreal Engine to use two GPUs to speed up the viewport and for rendering!
The GPUs must be setup with NVLink and there's many steps to follow.
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[@robertfontaine3650]

Using the llama 2 70b machine for gaming. I would be very happy to test one of these out for you for a year or two.

[@filipefalcone]

Congratulations, very good! Is there a way to do it for Twinmotion 2023.2? This 2 GPU process?

[@Maraik89]

That's a great tutorial thank you,do you think it would work out with 2 GTX 1080 11 GB

[@dmav2365]

Hi Alex! What can you tell about rendering time in movie render queue? The same double result increase? I mean path tracing.

[@hanson251985]

Multi-Process rendering for ue 5.3 ndisplay tutorial would be cool ;)

[@victorblanchard7774]

96Go Vram what a war machine you got dude!!! love that May I ask what CPU and motherboard you have on that system?

[@Xodroc]

Does this give you more available VRAM or does it get "shared"?

[@FPChris]

Can this be used to render VR?

[@ethanbrown-vl2du]

Hi！ I successfully set up two A6000 GPU according to your tutorial and performed path tracking rendering for the project in UE5. The rendering speed doubled and was fast, but after only two or three hours, the rendering crashed.But when I Used only one GPU, everything ok. How should I set the parameters?😢

[@YoMaMenWhatsSnake]

Does it work with games? I have two gpus... no sli nor nvlink

[@Ultramax2001]

Thank you for the helpful information~ I have a few questions. Can the RTX 4090 also be used as a multi-GPU in the same way?

[@AlexPearce3d]

No

[@perkristianfaldet7551]

Will the final packaged "game" require the same amount of Vram, as settings things up in UE5? I mean, if you approach the Vram limit with dual GPUs in UE5, will the final packaged "game" crash with one GPU ?

[@bensasi]

Thanks for this. I assume if I have 4 gpus this wont work since they need to be nvLinked? I do have an nvLink for my 3090s so might test that but have to turn off the other two :(

[@AlexPearce3d]

You don’t have to turn off the other two, but yea, you can only use the two on nvlink, and if you keep the others on you may have to specify which gpu(s) you’re using

[@bensasi]

@@AlexPearce3d so I can use all 4? or just the two that are linked but then somehow command select which 2 to run?

[@aeonbreak4728]

did dual 3090 work? @@bensasi

[@sb4photos]

Hi. So would that mean both gpu vram would be used same time? Thinking 2 4090 vs 1 a6000 ?

[@thng670]

Unfortunately, I don't think you can pool your Vram by combining 2 4090 because it does not have the nvlink/sli ability . Maybe it was done deliberately in order to not cannibalize their products such as the A0000 series cards

[@studiodevis]

Alex thank you for the tut. Can you make a video of Multi-GPU in Blender with the same config PC for SilverDraft? A multi-GPU with RTX3090 instead of A6000 is possible ? Thanks!

[@AlexPearce3d]

I don’t have two 3090s i can test sorry!

[@mk8_it]

i have the same setup i was also wishing someone can make one about blender did you ever find a video

[@studiodevis]

@@mk8_it nope

[@mk8_it]

@@studiodevis i found one but they keep taking my link down

[@ShadeTKV]

it is not working for 2 RTX 3060's .....

[@theothertoday]

You need an Nvlink capable GPU

[@JoTokutora]

Ah, that’s nvlink, not old sli. Curious if old sli would yield benefits. I have dual gtx 1070s

[@user-es7gf6rv6d]

Hi, I can not find SLI option in 3d settings, but showing 4 RTX A6000 gpus. I am renting Paperspace for 4x gpus but utilizes only one. any advice plz.

[@AlexPearce3d]

It has to have have an nvlink (a physical connection), and would only work with 2 of them. Also if they are the newest generation of a6000s it won’t work because they don’t supposing nvlink

[@RepaireroftheBreach]

I dont think this works with RTX 6000 Ada's as they dont support NVLINK. Only the previous generation 6000 card.

[@AlexPearce3d]

I think you are correct

[@blendragon28]

So this won't work without SLI on newer GPUs such as 4090 or 6000 ADA?

[@amirierfan]

NVIDIA seems to have discontinued support of the NVLink for 4090.

[@blendragon28]

@@amirierfan So I can't use 2 GPUs in Unreal without NVLink?

[@AlexPearce3d]

@hipninja1 correct

[@qntmstudios1214]

Will this work out of editor ? I want to run VR experiences powered by dual A6000's. Anybody know ?

[@thirdeye6362]

Does it work on AMD GPUs? I tried in my setup and it kept saying : Training Process: RuntimeError: Found no NVIDIA driver on your system. Please check that you have an NVIDIA GPU and installed a driver

[@AlexPearce3d]

No idea. Sorry :(

[@cultura_ue]

Hi Alex! Thank you for your video. You said GPU memory is going double when SLI. Are you sure? It is too good news for me to be a true. I have two rtx 3090 and I thinking now...

[@AlexPearce3d]

Yes it does double it!!

[@cultura_ue]

@@AlexPearce3d omg!!

[@OriginRow]

Seems it won't work for GPU Lightmass

[@AlexPearce3d]

Yes it should! In fact the best documentation for Multi-GPU I found was actually on the GPU Lightmass.

[@OriginRow]

@@AlexPearce3d cool 👍

[@KenanErenArt]

96gb of VRam! That's crazy

[@AlexPearce3d]

I know right?!!!

[@KenanErenArt]

You are swimming in technology right now :D@@AlexPearce3d

[@aeonbreak4728]

what if I dont have SLI but have 2 gpus?

[@AlexPearce3d]

I don’t think there’s a way to make unreal work with it, without SLI, unfortunately :( otherwise I would have put 4 gpus in my machine!

[@aeonbreak4728]

@@AlexPearce3d thats so unfortunate. there are so many people that would benefit of running dual 3060 for instance, or even dual 4090. but no, it feels they are excluding people who dont have dual ADA 6000 or dual 3090s out on purpose.