I'm running the Poser octane demo with 2 GTX 580 3GB cards, my question is does the renderer uses both cards and the 6GB of memory.  

 

Also I can load two gen 4 characters fine and it renders instantly but a Stonemason set never comes thru, the screen stays black.  I've seen videos showing Stonemason renders in Octane so I wonder if I need to setup things different.

 

What about using a third cheaper card for my monitor and leaving the 2 GTX 580 for Octane, will that help with Octane performance?