The only issue I've had, is the Pentium's screen refresh and video playback are much smoother when you're at less than 32MB of video memory. But if you're 32MB or above, it's not an issue. I have an AMD 500mhz and a PII 350, and the PII runs Poser about 45% faster in everything but renders. Render times ae about the same on both machines. Considering you can get a P4 2.0Ghz barebones system for $300, might as well go for the P4...