I own a 2 Gigahertz Pentium IV computer with 512 MB of Ram memory. I am definitely going to buy more memory. Poser IV seems slow in rendering. Moving material to be rendered into MAX is good when you can do it. It just seems to render faster and better. I don't know how much more expensive the 3.0 and above are but, if you can afford to, I would get the fastest that I could find.