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Optimistic_force0D44
Optimistic_force0D44
Known Participant
February 12, 2023
Question

How to select GPU in AE ???

  • February 12, 2023
  • 2 replies
  • 1958 views

Hi,

I have workstation with 3 GPUs (1*RTX 3090 and 2*RTX 4090) and i want to "assign" specific GPU to After Effects to use for textures/acceleration but for some reason AE always picks automatically "wrong" one ?

I want that AE use my RTX 3090 since that one i use for my monitors, and it's already using some VRAM by windows but other two (RTX 4090) i want to have all VRAM free/available (24GB) for my other GPU programs (Octane render in this case) but AE won't let me PICK which GPU to use, it just picks whatever it wants and in this case it's "wrong" one ?

Is there a way to fix/change that somehow ?

Thanks

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    2 replies

    Mylenium
    Mylenium
    Legend
    February 12, 2023

    That's odd. Perhaps connecting all your screens in a heterogenous setup throws things off because AE thinks there's not enough VRAM left on the primary GPU. I'd investigate this and unplug/ re-plug monitors.

     

    Mylenium

    Optimistic_force0D44
    Optimistic_force0D44Author
    Known Participant
    February 12, 2023

    After I boot in windows my 3090 has 23.6 GB Free (so monitors take up to 400MB) and 4090 both have 24 GB free so if AE thinks 23.6 GB VRam is "not enough" then yeah i'm expecting too much out of that app as you mentioned :).

    But still i'd like also official Adobe support to answer my question anyway if possible..

    Mylenium
    Mylenium
    Legend
    February 12, 2023

    AE will use whatever is your primary system GPU connected to your primary display device like pretty much any app. You have no control over this other than fiddling with the NVidia drivers to "hide" other GPUs by creatin g an application profile that excludes the other devices or even a Windows boot profile where they are present. anyway, it's a moot point. You are seriously overthinking this. AE's own GPU acceleration is negligible on so many levels and will never come close to exhausting even one of your GPUs. You could just turn off GPU functions entirely and wouldn't miss much other than some stuff being slower and e.g. realtime previews without RAM caching not working. And I would think the other way around the same is true for Octane: Unless you have a super large scene it may not at all use certain parts of the VRAM or all of the GPUs compute units.

     

    Mylenium

    Optimistic_force0D44
    Optimistic_force0D44Author
    Known Participant
    February 12, 2023

    Quote:
    "AE will use whatever is your primary system GPU connected to your primary display device like pretty much any app."

    Well that was what i though, but it's not workign that way, Photoshop picks 3090 but AE picks 4090 and won't let me change that :).
    My 3090 is my default GPU and all 3 monitors are connected to it (2*HDMI and 1*DP), I've even tired to set it in Nvidia drivers to be the preferred OpenGL GPU 3090 instead "Automatic", but AE ignores all that and still picks 4090 :(.

    I know AE is not using GPU much but in those rare moments i'd like it to use it/help in overall speed but right now it just annoys me and "eats" VRAM of of wrong GPU 🙂.

    Thanks for reply.

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