this post was submitted on 17 Feb 2025
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How to make use of dGPU and iGPU? (piefed.jeena.net)
submitted 1 week ago by jeena@piefed.jeena.net to c/linux@lemmy.ml
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I'm on Arch (btw.) and I have a Intel i5-14600K CPU with a iGPU (UHD Graphics 770) (GPU 1) in it and a dGPU from Nvidia, the RTX 3060 (GPU 0). I have one monitor connected to the 3060 via display port 1.4.

I can see both GPUs in GNOME Mission Center, but hte iGPU has always Clock Speed 0 and Utilization 0. So anything which is done on the GPU is done on the 3060.

I want to seperate what is done on the iGPU and what is done on the 3060:

dGPU (RTX 3060):

  1. Video editing
  2. video transcoding
  3. AI stuff (ollama)
  4. Machine learning
  5. Blender
  6. Steam games

iGPU (intel):

  1. Firefox (especially YouTube video decoding, it has hw acceleration for that)
  2. Chrome
  3. Libre Office
  4. GNOME
  5. etc.

I wonder if this or at least parts of it is possible. I need the whole 12 GB VRAM on the 3060 for ollama, and the iGPU is just sitting there doing nothing. Is there a way to distribute the work? Do I need two screens for that or something?

It might also be that I'm misunderstanding how the whole thing works or over estimating Linuxes capabilities.

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[–] MentalEdge@sopuli.xyz 14 points 1 week ago* (last edited 1 week ago) (1 children)

The integrated GPU in your processor is not an additional bit of computing power your computer is not using, but special software that can use your processor to put out graphics if a dedicated GPU is missing. It is extremely inferior at processing graphics compared to the real dedicated GPU, and if you were running firefox to watch (Not decode) youtube, you would very likely see things like screen tearing as the processor struggled to keep up.

This is straight up wrong. You are confusing GPUs with display adapters.

iGPUs are an actual on-die GPU, consiting of their own hardware, present on the die in addition to the CPU.

They can game. They can hardware decode and encode media, etc. They are full GPUs. Some are even quite powerful, though usually you'll find them to be designed for everyday use and only light gaming.

The GPU in every recent game console is technically an iGPU, same goes for phones, and the Steamdeck.

They do not "translate" GPU instructions into running on the CPU cores.

That's software rendering, and is what CPUs do when there isn't an iGPU at all. (Though they'll still need a display adapter, which a GPU can act as. But a display adapter doesn't need to be a full on GPU. And iGPUs aren't just display adapters.)

[–] Pogogunner@sopuli.xyz 3 points 1 week ago

TIL. Thank you