I am actually running a comparison between my machines, I have two with P5 ...I initially put it on my faster cpu system, 1.5 ghz, pent 4, 768 ram (upgraded ram and eliminated lots of problems just to start). Nvidia Gforce3Ti200; xp-pro ...P5 works ok but is slow and has repaint problems sometimes...other machine: amd Atholon at/at compatable; 1.5 g ram; Win2000; P5 works very well, no slow render problems, do have the post patch bump map c exception showing up; otherwise it works fine; Both are home built systems, no roxio; nero; both have nortosn antivirus and firewall; my P4 resides on the win2000 system....