No, currently not.
Yes. Of course, mobile GPUs deliver less performance than their desktop counterparts, but as long the System Requirements are met, it will work.
No. OctaneRender needs to load all scene data (geometries, texture maps, ...) into every GPU separately. This also means that the card with least VRAM available will set the limit for the whole rendering.
NVidia GTX *90 cards (for example, GTX 490, GTX 590, GTX 690, GTX 790) are dual GPU cards often marketed as 3GB cards. In fact such a card is equipped with 2 individual GPUs with 1536MB each. Since OctaneRender needs to load all needed data into the memory of every single GPU, it can only use the 1536MB which are available per GPU!
In single card setups the graphics card is used by misc. other apps as well, which require VRAM to work, most notably DAZ Studio itself. When using Windows 7 and Aero this will also lower the VRAM usable for rendering, and even modern Internet browsers (like Chrome, Firefox, Opera, IE9/10) will utilize resources from the graphics card.
SLI needs to be turned offin order to take full advantage of multi-GPU setups. OctaneRender performance will perfectly scale with as much Nvidia GPUs are installed in the system.
Select Window->Workspace->Off Screen Pane (Tab) Groups, which should re-position the panel so it can be closed.
Delete C:\Users\[Username]\OctaneRender\Data\OctaneRender_settings.oczdb, then re-authenticate the plugin by re-running the installer, or by running OctaneACM.exe from the DAZStudio exeutables folder (for example, C:\Program Files\DAZ 3D\DAZStudio4, or similar).
This is actually not Clay mode rendering, but rendering without any Octane MaterialsA set of attributes or parameters that describe surface characteristics.. To fix this, tick the Preferences->"Load Octane Materials from .duf user presets" and the reload your scene. If there are no Octane Materials saved in your scene, you will have to re-convert all the missing materials in the Materials tab->Missing button, or tick the Preferences->"Automatic material updates after content loads" checkbox and reload your scene. See the Preferences Tab topic for details.
This can happen when you render with multiple graphics cards, and one card loads the geometry update quicker than the others. If this happens, turn off one of your graphics cards.
Toon lights are not supported by the plugin, so you will need to export your scene to Octane Standalone in order to do Toon rendering.