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Since I now own a dual GPU setup I windered where I can see what is in use? I had somewhat strange effects. When I fired up an existing 3.1 Blender/Octane installation, startup went strangely slow and I got errors when trying to render, there were no GPUs mentioned in the system tab of the settings etc.

Deinstalled all and installed 3.2, which I wanted to do anyway. Setup everything from scratch, not using my saved config for blender. Now it works and I see the CUDA devices in the setup, each card single or en entry for 2x. Although I wonder if this matetrs at all or if the CUDA device selection in the blender options is only used by Cycles and ignored by the blender plugin?

In the render tab, I can select how many GPUs to use it seems ... there's the 8 spots to click, but I can click anything .. all 8 if I want. What do I have to do to be sure it uses both my 780ti's? Check the first two?

Check the first two?

Yes, the settings are not much informative.
I think JimStar has it on his todo.

Cheers, mib.

Is 8 gpus a hard limit?
I modified the add-on to add more cases but I don't know if it's enough.

I am quite interested in this as I have a system with 6x590 gtx, watercooled, 2 psu, all the fireworks and that would make 12 gpus. I haven't testes because I'm waiting for the riser cables. (It's for an animation with a tight deadline)

Will I be able to use them all at once with octane? Or do I have to go back to cycles for that?

I think it's a system limit of windows, not octanes.

vimaxus wrote: I am quite interested in this as I have a system with 6x590 gtx, watercooled, 2 psu, all the fireworks and that would make 12 gpus. I haven't testes because I'm waiting for the riser cables. (It's for an animation with a tight deadline)

drop a line how that goes! & if this monster will be able to run at full.

Look at the Cuda parameters in Octane preference panel.

For my own, I have 3 GPUs. The first in the Cuda list is a GTX 580, the second is a GTX 260 and the third is a GTX 580. I use the two GTX 580 for rendering and the GTX 260 for display.

In Blender plugin for Octane, I check the first and third boxes.