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Is something wrong with how Cycles uses my graphics card?

Forum Archive › Is something wrong with how Cycles uses my graphics card?

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  • August 26, 2025 at 4:01 pm #20671
    Sid Edwards
    Participant

      In the Cycles Rendering tab, I toggled my device between CPU and GPU multiple times, and each time, it made no difference at all in how fast the samples for my render were calculated. What’s going on? I have a good graphics card and I want to make sure Cycles is using it.

      August 26, 2025 at 4:04 pm #96784
      Sid Edwards
      Participant

        WOW! Holy shit, for YEARS I thought I was using my devices GPU, but I wasn’t, I was using CPU. When I went to edit-preferences-system and flipped a switch to my NVIDIA graphics card, suddenly the rendering was 1000 times faster!

        August 26, 2025 at 5:12 pm #96785
        Gerard van den Brul
        Participant

          I always select GPU. On a RTX4080 SUPER so thats quick enough.  Activating CPU in combination with GPU actually slows down rendering time. I leave it at dedicated GPU for rendering.

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