Poser has no idea how much memory it has access to - such things are controlled by Windows. When Poser runs out of memory, Windows automatically kicks in with swap - which is catastrophic in terms of performance. Coffee break. 400 vs 533 - in light of the fact that Poser5 tragically doesn't have 3D graphics support, just like P4, (not even general OpenGL), such things as RAM size & type, processor speed and FSB speed are completely decisive - Get the fastest you can, the most you can. And use Windows XP or W2K, nothing else. This applies to real time speed in preview and also for render times, both