I have a Gig of RAM on a dual 1Ghz PIII, with Win2k and a dual monitor Matrox, 1.5GB virtual memory. P5 works fine. No crashes, but some things get so slow that I feel like I'm on a old 386 again. The cloth room is VERY touchy. If polys are even too close between the figure and the cloth it can go into loops forever (but the program is still running, since I can still hit "Cancel" and stop the simulation within 30 seconds or so). Raytracing and anti-alias renders are also quite slow, though I've been using V3, which probably slows things down. The results of the renders are nice. You could have the fastest, most feature packed PC made today, and this program would probably still bring it to it's knees.