GPU memory problem

[AndyM1969]

This is driving me nuts, i have two 1080ti 11gb cards but Octane is only showing the used/available memory for one card. Both cards are identical makes/models. I have turned on/off every setting I can think of but nothing makes any difference.

Can someone please tell me how to make Octane show all available memory.

Thanks

[juanjgon]

In Octane each GPU must hold a copy of the full scene, so you are going to get always as used/free the memory reported by the GPU with less memory available. No matter if you have one, two or more GPUs. You're always limited to the active GPU that has the smallest amount of VRAM.

Thanks,
-Juanjo

[AndyM1969]

Don't think you understand mate, it's not recognising the memory from my second card AT ALL, both have 11gb, both are the EXACT same cards.

[juanjgon]

But why do you say that the memory of your second GPU is not recognizing at all? The render seems fine on your screengrab using both cards. There is only one memory report in Octane, and it is going to be the same for all the enabled GPUs. Two 11GB GPUs doesn't mean that you are going to have 22GB of VRAM for rendering ...

Thanks,
-Juanjo

[AndyM1969]

Okay, so if Octane doesn't see and use all the available memory what's the point in having more than one card?

[juanjgon]

Okay, so if Octane doesn't see and use all the available memory what's the point in having more than one card?

The rendering performance. Two cards render the scene almost twice faster than only one.

Thanks,
-Juanjo

[AndyM1969]

So I need to select 'Enable all GPU's for rendering'?

[juanjgon]

So I need to select 'Enable all GPU's for rendering'?

You can use this option, or enable all the GPUs yourself in the same panel. The "enable all GPUs" option is used only while rendering with F9/F10, to be sure that if you have GPUs disabled to work with the IPR (for example the display one), all the GPUs are going to be used for the final rendering.

Thanks,
-Juanjo

[AndyM1969]

Thanks Juanjo