I've got an athlon 2400 and 512 of memory. I still do fine. The only thing that seems to work on the rodluk castles is DAZ studio. I have poser 4 with pro pack as well. Just a dumb question but where did you get Bryce? If its one of the old Corel box sets you could need the update. Chances are if your Bryce comes in the box with the seacoast image and not the one with the round city that is currently on the DAZ website then you will need the 5.01 update. Corel dumped it off their FTP and DAZ doesn't have one up. If you need it I can email or temporarily file locker a copy you can download.