It looks like a very nice setup for the price without dedicated graphics. I'm not sure if Intel HD graphics are enough for AutoCAD however, as I would really suggest you to have chosen a system with a dedicated graphics. No worries though, the system looks easily upgradable and you can pick up the new AMD cards that recently got released for a great price/performance ratio. I often do 3D stuff in 3DS Max (Autodesk as well), and I can't stress how necessary a dedicated graphics card is needed for 3DS Max. Though I haven't used AutoCAD before, I'm pretty sure a dedicated graphics card would make it smoother.