I have an Athlon 1.8GHz CPU, 1Gb DDR RAM and a Geforce 4 MX440 graphics card. I also run XP Pro which doesn't have annoying glitches the only thing it doesn't do is refresh the taskbar when Bryce is running, and if your machine is only used for rendering then that wouldn't matter at all. I don't think it matters whether you use a PC or a MAC the only difference is that of price. You can buy a super fast PC for a fraction of the cost of a mediocre MAC. My 2 eurocents. Cat