I've been reading other threads about the GPU's that people are using and suggesting, but there's one thing I'm not clear on.
My limited understanding is that if you have a 2GB card and 4 GB card, Octane will use the 2GB card, since the scene has to "fit" on both cards.
What I'm not sure about, is if there's a way to force Octane to only use the 4GB card, and then use the 2GB just for system display(s).
I currently have a GTX 650TI, and would like to get either a 980 or 970...but if there's no way to force it to just use the 4GB card, I'll be stuck with that 1GB I have now.
Any info appreciated.
Questions about GPU VRAM between cards
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Yes, that is absolutely possible. 
Just connect your monitor(s) to your 2Gb card. Then in Octane's preference just activate the 4Gb card and de-activate the 2Gb card. Plugins should also have the ability to turn cards on and off.
Just connect your monitor(s) to your 2Gb card. Then in Octane's preference just activate the 4Gb card and de-activate the 2Gb card. Plugins should also have the ability to turn cards on and off.Linux Mint 21.3 x64 | Nvidia GTX 980 4GB (displays) RTX 2070 8GB| Intel I7 5820K 3.8 Ghz | 32Gb Memory | Nvidia Driver 535.171