Im on a 1200 mhz athlon with 512 mb and Win XP. And i think it fast enough( faster would be better but i wait till the really fast systems get cheaper) Dont think adding more ram would really increase rendering speed. And a second cpu, the program andthe os have to support a second cpu, and poser doesnt :-(( What can help is, switch of in the renderoptions all the things that slow rendering down( shadows,tansparencie) till you really need it for the final render