P4 2Ghz 1Gb PC2700DDR RAM 80Gb Drive, 20Gb Poser partition XP Pro Radeon 9700Pro SR2.1 Poser4 works, so does P5 after a fashion, what it won't do is work reliably when I swap .pz3 files between versions. Poses change abritrarily.... P5 is also a lot slower at rendering exactly the same scene, and it chokes, (some times crashes, sometimes locks) with more than 4 millenium characters in a scene. I Don't use any of the room save the pose room, and very occasionally the materials room. Running from a linked runtime, never tried V3.0, not using P4 lights. Not using P5 anynore either, come to that... :) I'll download SR3.0, but from the looks of it, it doesn't change that much. One wonders when service packs will stop requiring a re-install... later jb