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You will be fine. It runs perfect (even the giant maps with a full roster of opponents) on my 2GHz Core Duo w/ 2GB of RAM.
 
Maybe just me, because i run my macbook with an external monitor, but AOE2 is refusing to run for me, even when i set it to run in 256 colour mode
 
Hold command down when launching and check the 'don't change resolution for movies' box.
 
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