both gpu's vram not showing up in live viewer

[lyrical_o]

Hey Guys,

I have Octane 3 running on a pc with two - GeForce GTX 980 Ti 6GB cards. In the settings of Octane it shows the two cards, but in the live viewer the total vram is shown as 6gb. Should it not be 12gb and if so how to I activate both?

Images attached so you can see what I'm talking about.

Thanks in advance for your help.

Cheers.

[atome451]

Hi lyrical,

This question come back regularly.

The answer is no. Octane send exactly the same scene to each GPU then the total amount of available VRAM is indeed 6 Gb in your case.

In the case you own a GPU with 6 Gb VRAM and a GPU with 12 Gb VRAM, the total amount of available VRAM would be 6 Gb because Octane needs to send exactly the same information to each GPU. Then Octane is limited by the lowest memory available. The only solution in this case to have access to the 12 Gb is to desactivate the 6 Gb GPU for renders who need more memory.

I hope this make sense for you.

[lyrical_o]

Hi Atome,

Thanks for the reply. That Makes sense. But both the video cards are still being used to render the scene right? So if I had two more 6gb cards if would be two times faster?

Thanks

[atome451]

Yes

More GPU you have, more render power you have. It's almost arithmetic. There is maybe restrictions depending your hardware (motherboard, CPU PCI lanes, ... See Glimpse threads for more info), but it's the logic.