I would check application hardware requirement first.
yes you can run CAD on i3 machines just like you can use an on-board graphics chip
but not optimized, not even close especially for rendering
from Autodesk for 2018
CPU Type 32-bit: 1 gigahertz (GHz) or faster 32-bit (x86) processor
64-bit: 1 gigahertz (GHz) or faster 64-bit (x64) processor
Memory 32-bit: 2 GB (4 GB recommended)
64-bit: 4 GB (8 GB recommended)
Display Resolution Conventional Displays:
1360 x 768 (1920 x 1080 recommended) with True Color
High Resolution & 4K Displays:
Resolutions up to 3840 x 2160 supported on Windows 10, 64 bit systems (with capable display card)
Display Card Windows display adapter capable of 1360 x 768 with True Color capabilities and DirectX® 9 ¹. DirectX 11 compliant card recommended.
Disk Space Installation 4.0 GB