In answer to your question about Nvidia Optimus – I’m fairly sure that I have that.
I found this post: How can I make my computer use NVIDIA GPU instead of Intel GPU? - Platform & Builds - Unreal Engine Forums which didn’t yield much help, more folks in my situation without a solution.
I don’t have an option to set my video card within my bios, it’s fairly basic as well. I’ve disabled Windows Aero to attempt to squeak out more video RAM. I’ve even disabled my second monitor to see if that worked. I’ve adjusted my Intel settings to provide maximum performance. I have no idea what else I can do here.