The Mac version is more stable than the PC version, for instance theres a memory leak in P5 on the PC when rendering animations to single pictures. The PC sometimes simply stops. I have seen this behavior also when calculating dynamics both for clothes and hair - this never happened on the MAC. Also when you like to make big size renders - the Mac simply renders almost any size of output without complaining. Generally (I have no G5 yet) the MACS are slower than the PCs but much more reliable. If you are into serious commercial production and want something reliable nothing counts more than having the result. It often happended to me that I started a Python controlled render with many pictures on the PC on friday evening - when I came on monday it was simply crashed. I then transferred the whole project to the MAC and it rendered without complaining. Simple equation: Speed - take a PC (over 2 ghz, at least 2 gig RAM) Reliability: Take a MAC (any, but more is always better) Mungo