My children, right this very minute, are playing Sims2 on their macbooks (2ghz dual core, 2GB ram, 80GB hdd) without any issues what so ever. The video is on 1024x768 with everything set to medium detail and its smooth enough for them to be able to enjoy their game.
I will get them to install it on the iMac and let you know how that one goes a bit later on.
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