What do you consider "low-end"? I'm running P5 on a 400Mhz Pentium2, with 128MB RAM, and Win98. THAT is low-end ;P Runs ok for me, though large models and scenes react slowly (like the MilDragon) There's not going to be a lot of difference between the P4s and P5 speed wise. I'd say go for P5 anyway, but try the P4PP demo first. If you can run that you can run P5, though the dynamic stuff may be tough (I haven't bothered to try those on my computer, it'd crash most likely.)