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100% CPU usage when rendering

lithmawlithmaw Posts: 0
in Technical Help (nuts n bolts)

Hello, I'm using the latest version (4.24) and every time I render, my CPU goes 100% while my GPU stays below 10%. When I uncheck the CPU from the hardware settings, it always renders a blank output. All drivers are up to date.

Any solution to this? Thank you!

My specs:

7800x3D

5070Ti

32GB RAM

Comments

  • Richard HaseltineRichard Haseltine Posts: 107,973

    50x0 cards cannot be supported in DS 4.x, for Iray rendering you will need to use the DS 2025 Alpha https://www.daz3d.com/forums/discussion/728111/daz-studio-2025-alpha-version-6-25-2025-23807-updated-august-26-2025#latest

  • jjoynerjjoyner Posts: 748

    Richard Haseltine said:

    50x0 cards cannot be supported in DS 4.x, for Iray rendering you will need to use the DS 2025 Alpha https://www.daz3d.com/forums/discussion/728111/daz-studio-2025-alpha-version-6-25-2025-23807-updated-august-26-2025#latest

    Richard,

    Last week, I bought a desktop computer with an RTX 4070 GPU to avoid having to have two versions of Daz Studio in order to render in 3Delight and in Iray.  I picked up the computer last Tuesday and set it up.  On Thursday, I installed Daz Studio 4.24 and when I checked the Render/Hardware window, I was surprised to see that the computer has an RTX 5070 GPU!  However, I have been able to render in both 3Delight and Iray with Daz Studio 4.24 and an RTX 5070.  Am I missing something?

     

    CLX hardware.jpg
    1200 x 704 - 94K
    CLX Iray render.jpg
    1200 x 668 - 137K
  • barbultbarbult Posts: 26,215

    jjoyner said:

    Richard Haseltine said:

    50x0 cards cannot be supported in DS 4.x, for Iray rendering you will need to use the DS 2025 Alpha https://www.daz3d.com/forums/discussion/728111/daz-studio-2025-alpha-version-6-25-2025-23807-updated-august-26-2025#latest

    Richard,

    Last week, I bought a desktop computer with an RTX 4070 GPU to avoid having to have two versions of Daz Studio in order to render in 3Delight and in Iray.  I picked up the computer last Tuesday and set it up.  On Thursday, I installed Daz Studio 4.24 and when I checked the Render/Hardware window, I was surprised to see that the computer has an RTX 5070 GPU!  However, I have been able to render in both 3Delight and Iray with Daz Studio 4.24 and an RTX 5070.  Am I missing something?

     

    It's probably rendering with the CPU. 

  • Richard HaseltineRichard Haseltine Posts: 107,973

    barbult said:

    jjoyner said:

    Richard Haseltine said:

    50x0 cards cannot be supported in DS 4.x, for Iray rendering you will need to use the DS 2025 Alpha https://www.daz3d.com/forums/discussion/728111/daz-studio-2025-alpha-version-6-25-2025-23807-updated-august-26-2025#latest

    Richard,

    Last week, I bought a desktop computer with an RTX 4070 GPU to avoid having to have two versions of Daz Studio in order to render in 3Delight and in Iray.  I picked up the computer last Tuesday and set it up.  On Thursday, I installed Daz Studio 4.24 and when I checked the Render/Hardware window, I was surprised to see that the computer has an RTX 5070 GPU!  However, I have been able to render in both 3Delight and Iray with Daz Studio 4.24 and an RTX 5070.  Am I missing something?

     

    It's probably rendering with the CPU. 

    Yes, it is only the GPU acceleration that is not available for 50x0 cards - I should have been clearer. Non GPU stuff works, and non-Iray GPU stuff (e.g. dForce) works too.

  • crosswindcrosswind Posts: 9,552

    jjoyner said:

    Richard Haseltine said:

    50x0 cards cannot be supported in DS 4.x, for Iray rendering you will need to use the DS 2025 Alpha https://www.daz3d.com/forums/discussion/728111/daz-studio-2025-alpha-version-6-25-2025-23807-updated-august-26-2025#latest

    Richard,

    Last week, I bought a desktop computer with an RTX 4070 GPU to avoid having to have two versions of Daz Studio in order to render in 3Delight and in Iray.  I picked up the computer last Tuesday and set it up.  On Thursday, I installed Daz Studio 4.24 and when I checked the Render/Hardware window, I was surprised to see that the computer has an RTX 5070 GPU!  However, I have been able to render in both 3Delight and Iray with Daz Studio 4.24 and an RTX 5070.  Am I missing something?

     

    Interesting ~~ but you should've unchecked CPU option before testing. Also you could've checked DS log to confirm which device DS used to render. 

  • jjoynerjjoyner Posts: 748
    edited September 1

    @Richard Haseltine and @crosswind,

    Thanks for your feedback. I finally see what is happening.  I did Iray test renders again

    1. with the GPU turned on and the CPU turned off in DS and nothing  rendered.
    2. with the GPU and the CPU turned on in DS and an Iray render was produced but the rendering was done with the CPU.

    Select lines from the Help Log are provided below.

    Since the RTX 5070 GPU is doing no Iray render work, I need to return the computer for a refund and try to find a computer with an RTX 40x0 GPU.

     

    CPU turned off in Render Settings

    2025-08-31 20:34:58.016 [WARNING] :: \src\pluginsource\DzIrayRender\dzneuraymgr.cpp(373): Iray [ERROR] - IRAY:RENDER ::   1.0   IRAY   rend error: Cannot render: found no usable devices. Please update your NVIDIA driver (www.nvidia.com) to at least 537.13, or enable CPU rendering.

    2025-08-31 20:34:58.039 [INFO] :: Finished rendering.

    2025-08-31 20:34:58.056 [INFO] :: Total Rendering Time: 0.17 seconds

     

    2025-08-31 20:35:17.842 Iray [INFO] - IRT:RENDER ::   1.0   IRT    rend info : Resource assignment for host 0 has changed.

    2025-08-31 20:35:19.034 [WARNING] :: \src\pluginsource\DzIrayRender\dzneuraymgr.cpp(373): Iray [WARNING] - IRAY:RENDER ::   1.0   IRAY   rend warn : There is no CUDA-capable GPU available to the iray photoreal renderer.

     

    CPU turned on in Render Settings

    2025-08-31 20:35:23.671 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Initializing local rendering.

    2025-08-31 20:35:23.672 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : CPU: using 32 cores for rendering

    2025-08-31 20:35:23.672 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Rendering with 1 device(s):

    2025-08-31 20:35:23.672 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info :             CPU

    2025-08-31 20:35:23.672 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Rendering...

    2025-08-31 20:35:23.672 Iray [INFO] - IRAY:RENDER ::   1.7   IRAY   rend progr: CPU: Processing scene...

    2025-08-31 20:35:39.736 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Received update to 00361 iterations after 16.065 s.

    2025-08-31 20:35:39.737 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend progr: Convergence threshold reached.

    2025-08-31 20:35:40.793 [INFO] :: Saved image: C:\Users\JoeJ\AppData\Roaming\DAZ 3D\Studio4\temp\render\r.png

    2025-08-31 20:35:40.793 [INFO] :: Finished rendering.

    2025-08-31 20:35:40.811 [INFO] :: Total Rendering Time: 17.27 seconds

    2025-08-31 20:35:40.817 [INFO] :: Loaded image: r.png

    2025-08-31 20:35:40.824 [INFO] :: Saved image: C:\Users\JoeJ\AppData\Roaming\DAZ 3D\Studio4\temp\RenderAlbumTmp\Render 2.jpg

    2025-08-31 20:35:42.801 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Device statistics:

    2025-08-31 20:35:42.801 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : CPU: 384 iterations, 0.294s init, 16.722s render

    Post edited by jjoyner on
  • crosswindcrosswind Posts: 9,552

    jjoyner said:

    @Richard Haseltine and @crosswind,

    Thanks for your feedback. I finally see what is happening.  I did Iray test renders again

    1. with the GPU turned on and the CPU turned off in DS and nothing  rendered.
    2. with the GPU and the CPU turned on in DS and an Iray render was produced but the rendering was done with the CPU.

    Select lines from the Help Log are provided below.

    Since the RTX 5070 GPU is doing no Iray render work, I need to return the computer for a refund and try to find a computer with an RTX 40x0 GPU.

     

    CPU turned off in Render Settings

    2025-08-31 20:34:58.016 [WARNING] :: \src\pluginsource\DzIrayRender\dzneuraymgr.cpp(373): Iray [ERROR] - IRAY:RENDER ::   1.0   IRAY   rend error: Cannot render: found no usable devices. Please update your NVIDIA driver (www.nvidia.com) to at least 537.13, or enable CPU rendering.

    2025-08-31 20:34:58.039 [INFO] :: Finished rendering.

    2025-08-31 20:34:58.056 [INFO] :: Total Rendering Time: 0.17 seconds

     

    2025-08-31 20:35:17.842 Iray [INFO] - IRT:RENDER ::   1.0   IRT    rend info : Resource assignment for host 0 has changed.

    2025-08-31 20:35:19.034 [WARNING] :: \src\pluginsource\DzIrayRender\dzneuraymgr.cpp(373): Iray [WARNING] - IRAY:RENDER ::   1.0   IRAY   rend warn : There is no CUDA-capable GPU available to the iray photoreal renderer.

     

    CPU turned on in Render Settings

    2025-08-31 20:35:23.671 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Initializing local rendering.

    2025-08-31 20:35:23.672 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : CPU: using 32 cores for rendering

    2025-08-31 20:35:23.672 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Rendering with 1 device(s):

    2025-08-31 20:35:23.672 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info :             CPU

    2025-08-31 20:35:23.672 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Rendering...

    2025-08-31 20:35:23.672 Iray [INFO] - IRAY:RENDER ::   1.7   IRAY   rend progr: CPU: Processing scene...

    2025-08-31 20:35:39.736 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Received update to 00361 iterations after 16.065 s.

    2025-08-31 20:35:39.737 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend progr: Convergence threshold reached.

    2025-08-31 20:35:40.793 [INFO] :: Saved image: C:\Users\JoeJ\AppData\Roaming\DAZ 3D\Studio4\temp\render\r.png

    2025-08-31 20:35:40.793 [INFO] :: Finished rendering.

    2025-08-31 20:35:40.811 [INFO] :: Total Rendering Time: 17.27 seconds

    2025-08-31 20:35:40.817 [INFO] :: Loaded image: r.png

    2025-08-31 20:35:40.824 [INFO] :: Saved image: C:\Users\JoeJ\AppData\Roaming\DAZ 3D\Studio4\temp\RenderAlbumTmp\Render 2.jpg

    2025-08-31 20:35:42.801 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : Device statistics:

    2025-08-31 20:35:42.801 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend info : CPU: 384 iterations, 0.294s init, 16.722s render

    Ah, right ! yes 

  • CAV_18687CAV_18687 Posts: 123

    Any news on when we will get 50 series support?

  • Richard HaseltineRichard Haseltine Posts: 107,973

    CAV_18687 said:

    Any news on when we will get 50 series support?

    For Iray it is in DS 2025, it will not (cannot) be added to 4.x.x.x. All other tasks using the GPU already support the 50x0 cards in DS 4 and 2025.

  • CAV_18687CAV_18687 Posts: 123

    Richard Haseltine said:

    CAV_18687 said:

    Any news on when we will get 50 series support?

    For Iray it is in DS 2025, it will not (cannot) be added to 4.x.x.x. All other tasks using the GPU already support the 50x0 cards in DS 4 and 2025.

    Thank you Richard

  • CAV_18687CAV_18687 Posts: 123

    Richard Haseltine said:

    CAV_18687 said:

    Any news on when we will get 50 series support?

    For Iray it is in DS 2025, it will not (cannot) be added to 4.x.x.x. All other tasks using the GPU already support the 50x0 cards in DS 4 and 2025.

    Thank you Richard

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