I'd say the the internal Intel iGPU would be ok. A dedicated GPU would be smoother for panning and zooming large complicated drawings, but I'm using AutoCad 2015 on an internal Intel HD P3000, and it seems ok. A bit jumpy at times, but it works nonetheless.
I have a GTX760 too, but unfortunately I can't get it to work with AutoCad 2015 at the moment, Autodesk and Nvidia are trying to sort it out. I hope.
Darawork
AutoDesk User
Windows 10/11, 3DS Max 2022/24, Revit 2022, AutoCad 2024, Dell Precision 5810/20, ASUS DIY, nVidia Quadro P5000/RTX 5000/GTX760