While 8GB might be sufficient to runt he editor itself, it might not be enough for the workflows of game development.
Usually you will not only have the editor open, but also applications like 3DSmax, Photoshop, etc.
It would turn out very frustrating to close the editor, just because you want to tweak a model in .
You would be more opening and closing application than working with them…
I have 32GB and this sufficient to run the editor and most other external programs at the same time…