P5 runs on Windows 98se, 2000, ME and XP that's 4 different versions of the OS, all wich have their own quirks and memory handling 'features'. P5 Mac will be running on only 1 version of Mac OSX which will eliminate around 90% of the hassles the PC version had to deal with leaving only memory and system speed issues to deal with. So, in the fine print at the bottom of the page, the Mac version should run a lot smoother out of the box. :-)

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