RAM is useful for rendering if you have some dynamic ecosystems in your scene.

In that case, you will notice that Vue will increase the amount of RAM used at the beginning of your render, when creating the dynamic ecosystems. 

I made my "Mad Gorges" (http://www.cornucopia3d.com/focus/OlivierFfrenchFocus.php?intro) scene in Vue 7 and was barely able to work on it with 8 gigs of RAM.
I can no longer render it in V8, 9 or 10 because I do not have enough RAM to handle the dynamic ecosystem. When rendering, Vue eats up all the available memory, which forces my PC to swap and reduces it to a crawl.

Fantasy pictures, free 3d models, 3d tutorials and seamless textures on Virtual Lands.