The computer i have is an iMac (late 2009) with 4gig Ram. But i can expand it up to 16gig.
The OS is Snow Leopard (10.6.3). AE version is CS5, the processor of my computer is 2,66-GHz Intel Core i5-processor.
If i render my comp at half of the qaulity i have no problems, but when it is in full quality it has playback problems like dropping frames and so.