My computer works tolerably well with Windows XP, 512MB of RAM, and a Celeron processor. Poser didn't work as well with less memory. Poser would work better if I had a more powerful computer. My computer is old enough that I really can't do anything more to upgrade the hardware itself. What am I trying to say? Memory is important to an extent. I wouldn't consider using less than 512MB of RAM for serious Poser usage. The best combination is to have an up-to-date computer, and at least 512MB of RAM.