I'm running it on a 1.4 mhz pentium with 512 megs of ram, and I still can't render poser 5 dynamic hair. it goes for 20 minutes without putting a single pixel on the render, and then I give up. I haven't tried dynamic cloth yet, but I assume it'll be more of the same. So.... the only thing I get to use is the Face Room. If you aren't going to upgrade your cpu anytime soon, then you'd be better off with poser 4 with the propack. THAT would run, albeit rather slowly.....