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DAZ|Studio F.A.Q (Updated: 2020 Sep 04 1:56 pm)


 Subject: Help with Nvidia Iray and GPU usage

LilLili opened this issue on Sep 23, 2020 · 12 posts

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  LilLili    ( ) ( posted at 4:42PM Wed, 23 September 2020 

Hi all, Is there a way to make the Nvidia Iray utilize more GPU memory? I have an i9 and a 2080Ti (11gig), but rendering uses 100% of my CPU, and 0% of my GPU. It feels like rendering takes a really long time so I'm hoping there is a way to let Iray utilize my GPU, but I dont know anything about Render settings.


  Razor42    ( ) ( posted at 8:13PM Wed, 23 September 2020  · @4400159

Check --------------> Render Settings ---------> Advanced

You can select your graphics card or cpu here.



  LilLili    ( ) ( posted at 8:19PM Wed, 23 September 2020  · @4400160

If I select only my gpu, nothing renders in my window :(


  Razor42    ( ) ( posted at 8:32PM Wed, 23 September 2020  · @4400161

Hmm, I would suggest making sure both your Graphic card drivers and Daz Studio are both the latest versions available.



  Liquid_Ice    ( ) ( posted at 4:30AM Thu, 24 September 2020  · @4400170

you have 11 gb on your gpu, I have 8.Do not forget that daz can use a lot of the available space on your gpu. You dont really have 11 GB free, more like 9 or 10. Make sure you have the latest drivers and the lastest studio version. There is also a bug in daz studio that it sometimes doesnt render with gpu, you have to restart studio in order to use the gpu again.

Also i would first make a small render and see if studio uses the GPU( say 400x400). You can see on the renderpane if daz uses the gpu or CPU( you can see CPU in the renderpane, if studio switched over to cpu]

I have had this happen and had to downsize the render size. sometimes i can render larger but than i have less content in the scene.


  LilLili    ( ) ( posted at 9:15AM Thu, 24 September 2020  · @4400180

Is it possible to utilize both CPU and GPU? If I select both in settings, Daz only uses my CPU. Is that the bug you mentioned?


  RHaseltine    ( ) ( posted at 9:28AM Thu, 24 September 2020  · @4400181

If the GPU is checked, the drivers are sufficiently up-to-date, and the scene fits into its memory then the GPU will be used 9and the CPU, if that is checked). Try a really simple scene (just Create>New Primitive and add any you like with its default values) - that should render really quickly, so after it's done go to Help>Troubleshooting>View Log File, scroll to the end and in the last few lines there should be a summary of which things did what to the render - was the GPU used according to that?

Do bear in mind that, by default, Windows Task Manager will not show the Iray usage - if you go to the Performance tab and set one of the graphs for the GPU to show CUDA (or Compute 0 if there's no option for CUDA) you will get a more accurate result.


  LilLili    ( ) ( posted at 11:01AM Thu, 24 September 2020  · @4400186

So with both CPU and GPU checked, it takes roughly 20 minutes or more to fully render a scene with only Victoria 8, and nothing else. Does that sound normal? It seems really long to me. All my drivers are up to date, and I'm using default render settings, apart from the check boxes for CPU and GPU.


  LilLili    ( ) ( posted at 11:06AM Thu, 24 September 2020  · @4400188

This might be the issue:

2020-09-20 15:48:38.831 WARNING: dzneuraymgr.cpp(307): Iray WARNING - module:category(IRAY:RENDER): 1.0 IRAY rend warn : GPU 1 (GeForce RTX 2080 Ti) with CUDA compute capability 7.5 cannot be used by iray photoreal. 2020-09-20 15:48:38.831 WARNING: dzneuraymgr.cpp(307): Iray WARNING - module:category(IRAY:RENDER): 1.0 IRAY rend warn : There is no CUDA-capable GPU available to the iray photoreal renderer.


  LilLili    ( ) ( posted at 11:31AM Thu, 24 September 2020  · @4400194

I downloaded and installed CUDA 11.1, but still getting errors :(

2020-09-24 10:24:58.406 Iray INFO - module:category(IRAY:RENDER): 1.1 IRAY rend info : NVIDIA display driver version: 456.43 2020-09-24 10:24:58.406 Iray INFO - module:category(IRAY:RENDER): 1.1 IRAY rend info : Your NVIDIA driver supports CUDA version up to 11.1; iray requires CUDA version 8.0; all is good. 2020-09-24 10:24:58.421 WARNING: dzneuraymgr.cpp(307): Iray WARNING - module:category(IRAY:RENDER): 1.1 IRAY rend warn : CUDA device 0 (GeForce RTX 2080 Ti): compute capability 7.5: unsupported by this version of iray, please look for an update with your software provider. 2020-09-24 10:24:58.421 Iray INFO - module:category(IRAY:RENDER): 1.1 IRAY rend info : Using iray plugin version 4.6-beta, build 287000.7672 n, 23 May 2017, nt-x86-64-vc11. 2020-09-24 10:24:58.421 WARNING: dzneuraymgr.cpp(307): Iray WARNING - module:category(IRAY:RENDER): 1.1 IRAY rend warn : GPU 1 (GeForce RTX 2080 Ti) with CUDA compute capability 7.5 cannot be used by iray photoreal. 2020-09-24 10:24:58.421 WARNING: dzneuraymgr.cpp(307): Iray WARNING - module:category(IRAY:RENDER): 1.1 IRAY rend warn : There is no CUDA-capable GPU available to the iray photoreal renderer.


  RHaseltine    ( ) ( posted at 2:59PM Thu, 24 September 2020 · edited on 3:00PM Thu, 24 September 2020 · @4400197

You need to update your GPU driver. Unless you are on a Mac (which I assume you are not) you don't download CUDA separately. Or you mat need to update DS, I don't think you've said which version you are on.


  LilLili    ( ) ( posted at 3:03PM Thu, 24 September 2020  · @4400198

Oh my gosh I feel so dumb. Its because I've been still using 4.10. As soon as I upgraded to 4.12, the issue went away and Iray can now do ~1000 iterations per minute


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