Concerning PC spec...
Quote:
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EA has taken the players into consideration in the development, and when the game is released it will not require high end graphics as with other games. Although graphics will not be able to be the bare minimum, they will not be extremely high.
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This was taken from GameStar magazine, and here is a link to the info...
Infinite Sims - GameStar Facts
So, it doesn't seem that you will need to splash out on the most recent computers, with quad core processors and whatnot.
Also, this website seems good for Sims 3 info.