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But isn't your CPU just as important part of the package?

Not really IMHO, all Mac's come with decent CPUs, it will have some effect but the gfx is a much bigger factor in the overall performance.
 
The intent of my comparison was a new Mac versus a 5 year old Mac. :)

Even for older Mac's the graphics card is still more important. Having an under powered graphics card will stop you from gaming long before the CPU will.*

Edwin

*Your experience my vary
 
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