Using CPU Intel HD Graphics with NVidia GPU's?

[Spectralis]

Concerning other software, would Vegas Pro 13 and plugins like BorisFX BCC 9 still be able to use the NVidia GPU's if I assign the display to my Intel GPU? Also, will DAZ Studio IRAY still be able to use the NVidia GPU's? Is only Octane able to use the NVidia GPU's when they aren't driving the display as well?

Every other software will only be able to utilize your onboard GPUs rendering capabilities.
As to my knowledge, Octane (and its API) is one of the few pieces of software out there, that can access GPUs in PCIex-slots, which weren't assigned with tasks. Other GPU renderers do this as well obviously...

Not sure how Boris / Vegas etc. are working on the onboard GPU - same goes for DAZ Studio and Iray renderes.
Just never tried it, would certainly be interesting to know though...

Thanks for your comments. I'm not sure whether it's worth experimenting with this as I don't know a way of testing if other software is able to access the NVidia GPU's if I'm using the Intel GPU to drive the display. Vegas Pro's GPU capabilities are pretty flaky when it comes to newer NVidia cards. If there was software that could test this then it might be worth experimenting. I don't want to go to the trouble of switching drivers only to find NLE/IRAY/plugin rendering slows to a crawl.