How to chose what GPU to run.

[Sandman192@gmail.com]

I have 3 GPUs.
1 APU AMD 7700X
1 GTX 1080Ti
1 GTX 980
Don't ask.

All I can do is run the primary 1080Ti.
I want to run another GPU and run them all.

v1.35.00

[Stefan]

Activate iGPU and dGPU in mainboard BIOS.

Check device manager for code 43 or similar.
If it's there, try the fixes suggested by Microsoft.

If you don't see any yellow bangs, run GPU Caps Viewer to check what your GPUs are doing.
Switch GPUs via pulldown menu and upload some screenshots.

For FurMark 1, select GPU via Windows control panel or disable unwanted GPUs in device manager.
OpenGL is limited to the "primary GPU"

Otherwise upgrade to FurMark 2 beta, there you can select GPUs under Vulkan API.