I have Dell Inspirion 3542 with:
Intel(R) Celeron(R) 2957U @ 1.40GHz (2 cores),
4 Gb RAM,
Haswell-ULT Integrated Graphics Controller.
I tryed to play with Advanced Vehicle Template, it worked smoothly, without freezing/glitches.
My system consumes 2+ Gb of RAM when trying templates.
So I think I can use UE4 for simple 3D or for heavy 2D games (without having possible troubles in the future), right ?