No. It is 2.4 gb mostly.
I have 4 gb ram , windows 7 64 bit.
I tried some basic things:
When i click on the " Cameras " button over the 3d preview window and wait nothing happens(no error).
When i click on the " Renderers " button the preview windows does not draw all things alright at the end(similar to the real rendering) and the error comes up.
I tried it with the other buttons and it seems related if the Atmosphere is drawn or not in the preview .
If i trigger a redraw that does not render the atmosphere i get no warning and no problem with the preview.
I bypassed one node tree and it did go away. It is scene specific as we thought
But it is interesting that it can so much wrong.
I will try a GI render too. Just to test if it will render OK without that node tree Oshyan.