So what's coming clear to me is that it would be a waste of money to insert more than 2GB in this machine since Windows just consumes 190MB, leaving 1.8GB of RAM for Poser. Today I did some experimenting on raytracing instead of pre-rendered lightning maps, although the rendering time increases, it uses less memory. @SamTheRapy, Robo2010, tastiger, Do these memory problems also occur on simple scenes or only the complex ones?