[koutakun]

> You need something beefy if you're serious/professional about those

But you can get way better results with the lowest end computers than you could years ago. Back in the 90s my grandfather used 3DS Max to map out his future apartment's rooms and start planning furniture, using renders to get an idea of how sunshine would look like at different times, etc. At the time, he did this on an expensive 486 that would take an entire day to render some of those visuals. Nowadays I can do the same with a free copy of Blender and any reasonably modern integrated GPU in probably under an hour.

[anthk]

You can just use SweetHome3D (GPL too) and call it a day. No need to mess with models, everything can be set and adjusted. Just design in a plane, set heights/widths for forniture, walls and the like, set a final render settings (hour of the day/sunny/cloudy and such) and even an Elementary kid could finish the work.

[vardump]

"Nowadays I can do the same with a free copy of Blender and any reasonably modern integrated GPU in probably under an hour."

Try seconds or at most minutes.