I remember that my complex scenes rendered much faster when I bought more RAM. A swapping harddisk is much slower. Usually my CPU was only working at 75% or less (I've seen it at 13%!). The harddisk just couldn't keep up with the CPU in terms of providing data. But my ram writes at 843 MB/sec and that is much faster. Now my CPU doesn't have to wait for more data to process. So I think that I can conclude that the more complex your scenes are the more RAM you need. And for me that means more RAM is always better.

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