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eugene_lukas
Participant
May 27, 2025

Iray stuck on 'warm-up' with RTX 5090 – only works with CPU enabled

  • May 27, 2025
  • 23 replies
  • 3713 views

Hi,
I recently upgraded to a new ASUS RTX 5090, and I’m experiencing an issue with Iray in the latest version of Substance Painter.
All system and GPU drivers are fully up to date.

When I set Iray to render only on the GPU (disabling CPU rendering), the viewport freezes and displays “Iray warm-up” in the bottom-right corner. The program doesn’t crash, but the rendering does not proceed — the image remains frozen indefinitely.

If I re-enable CPU rendering, the frame immediately unfreezes and Iray starts rendering normally.

I have tested this with both the latest Studio and Game Ready NVIDIA drivers — the issue remains the same.

This problem did not occur with my previous GPUs (GTX 1070, RTX 3090, RTX 4090) — they all rendered fine using GPU-only mode in Iray.

Could this be due to Iray not yet supporting the RTX 5090 architecture?
Is there a workaround or upcoming update planned to support this GPU?

Thank you in advance!

      23 replies

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      Tyrosine25
      Participant
      June 5, 2025

      I'm testing an Inno3D RTX 5070 and same issue in Substance Designer 2022. If i switch to Iray mode, the 3D window freezes. Not responding at all on camera moves and rotations and stucked at 0/500 render. Tested with latest drivers 576.52 studio and game ready. With my own cards it's working fine GTX 1050Ti and RX 590

      C
      charles.e.bolton
      Participant
      June 2, 2025

      Same here - ASUS RTX5090, latest drivers - but can only render using CPU. 

        B
        Ben32990294z6vl
        Participant
        May 27, 2025

        I have a RTX 5090 also and I can confirm that I also have the problem. I think its because of the version of IRAY that Substance painter uses isnt fully up to date and as such doesnt support any RTX 50 series GPU. This is me just making a educated guess however as so few people have a 5090 its hard to see whats actully causing it.

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