I have a 2.4G Pentium 4 with 2G memory, it's slow but bearable to work in that environment. This is because I have 4 huge runtimes linked. If you plan to use nothing but Poser 5 material-- Don and Judy Posette and Dork, then you can get by with your current set up but you will still not be happy with speed. You'll have a very difficult if not impossible time trying to work with V3 and M3. Nothing can make P5 a speedster, however, more processor helps the poseing speed and more memory helps the rendering speed because you can up the bucket size and have a comfortable memory. With 2G I can up the bucket to over 200 and render quite fast for Poser 5 with firefly, but that takes RAM.