When I try to render a 3000 x 4500 scene with c. 300k vertices from Blender I get this message. It somewhat deals with the complexity/size of the render but there seems to be still plenty of memory to use (total 2Gigs of RAM).
Its a classic out of Ram error from Indigo, does lower resolutions work fine for you??
to check how much RAM your Meshes, textures etc. take try a 1x1 pixel rendering!
Try using the indigo_console build, it should massively save the Used RAM!
