Hi!
I've just installed the Iray Render Plugin.
Rendering took a while, so I looked at my task manager and noticed, that the Iray Background Renderer used the CPU nearly 100%, while the GPU (GeForce GTX 1070) was used  0%, somtimes 1 o or 2 %.
But in the hardware settings the GPU is enabled.
Is this normal?
Thanks for your advices!

No, not normal.

I know this sounds lame, but try a reboot.

I've seen "something" get all gummed up after a lot of Iray usage, and it falls back to using the CPU rather than GPU.  I think it's related to some sort of memory leak, either in Iray or the plug-in.  (The plug-in is my prime suspect.)  Anyhoo... a reboot seems to restore proper GPU rendering for me.

Good luck, let me/us know if that helped or not.

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iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual  monitors.
Laptop - Windows 10, MSI GS63VR STEALTH-252, 16GB RAM, GTX 1060 (6GB), 256GB SSD and 1TB HDD

I would advice to get a hold of GPU-z
Task manager does not take into the the account the computing factor for some reason (at least in my edition of windows)
I have to get into it deep and enable computing counter, then it would show me the statistics

Just by way of reference, I have the GTX-1070 and during iRay rendering, both my CPU and GPU go to Maximum ......

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Please be patient with me ..... I don't always 'get it' the first time 'round - not even the 2nd time!   - yikes! ... 

● MSI GT72VR Laptop, i7 7700HQ 4-Core 3.8 GHz 16GB RAM; Nvidia 1070, 8GB Vram ● iClone-7.93 ● 3DXChange Pipeline 7.81 ● CC-3 Pipeline 3.44 ● Live Face ● HeadShot ● Brekel Pro-Body ● Popcorn FX ● iRAY ● Kinect V2 ● DaVinci Resolve17 ● Mixcraft 8.1

Thank you very much for your answers!
After rebooting the taskmanager showed the GPU usage of character creator correctly.
And I installed GPU-Z and it showed that the GPU was working 100% while rendering with Iray background renderer (while the taskmanager still showed 0%).
Thanks again

(I disabled the CPU usage in the settings of Iray, it doesn't make any difference.
Rendering the standard-image (when opening character creator 3) in HD takes about 1 minute, no matter if CPU is enabled or not.
Using only the CPU (without GPU) takes about 8 minutes)