In one of our machines we are getting this Optix error if we try to use the denoiser, the render with optix works, the GPU is a GTX1080, in a different system we have the same GPU and it’s working fine, the drivers are the latest 450:
Interesting that I found this now. I get the same error with the 2.9 release. However, deleting the userpref.blend didn’t seem to fix the issue. I’m running a RTX 2070 gpu and don’t seem to have any problems with Blender 2.83.5 or any earlier versions using Optix denoise.
Pop!_OS 20.10 , GTX 1080 ti , Blender 2.91 beta
Same problem happened to me when I activate LuxCore render Add-on.
By deactivate it the problem is solved without deleting userpref.blend
I can confirm that LuxCore render appears to be the problem, though I’m not certain has been an issue from the day I turned LuxCore on. I think it only appeared a few days later. However, disabling LuxCore gets Optix denoising working again.
I had the same problem, but I resolved it only by updating my GTX drivers. Try this solution before you delete anything. It might help… If don’t… Yeah… Press “X” to delete this usepref file