How to select GPU on a two GPU System

Hi all found this: https://forum.unity.com/threads/how-to-select-gpu.408389/
But no Answers.

And found this: https://forum.unity.com/threads/use...7.1526308535.1640768994-1848339195.1640768994

But it seems not to work:

Code (CSharp):

1.  
2. // Not working; Uses GPU 0 instead of 1
3. "3D Sample Scene (HDRP).exe" -gpu 1
4.  
5. // Not working; Uses GPU 0 instead of 1
6. "3D Sample Scene (HDRP).exe" "-gpu 1"
7.  
8. // Not working; Uses GPU 0 instead of 1
9. "3D Sample Scene (HDRP).exe" "-GPU 1"
10.  
11. // Not working; Uses GPU 0 instead of 1
12. "3D Sample Scene (HDRP).exe" -GPU 1
13.  
14. // Not working; Uses GPU 0 instead of 1
15. "3D Sample Scene (HDRP).exe" -gpu=1
16.  
17. // Not working; Uses GPU 0 instead of 1
18. "3D Sample Scene (HDRP).exe" "-gpu=1"
19.  
20. // Not working; Uses GPU 0 instead of 1
21. "3D Sample Scene (HDRP).exe" "-GPU=1"
22.  
23.  
24. // Not working; Uses GPU 0 instead of 1
25. "3D Sample Scene (HDRP).exe" -GPU=1
26.  
27.  

For sure I also tried all variances of "-gpu 0" as well but no luck so far.

Also selecting the Build ( 3D Sample Scene (HDRP).exe ) with a right click and using "Render OpenGL on / Quadro RTX 4000" doesn't use the second GPU.

Using Windows 11 / 10 with Unity 2020.3.25f1.1418 Personal. Maybe somone has experiences regarding that or Ideas.