When should I upgrade the RAM in my new iMac 5K?

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as far know activity monitor anyway ram full because cache all, thats right?
how can know when useful upgrade 8gb ram?
 

it quite normal of memory in use os x. not mean running out of memory or maxed out. os x manage available memory, making available apps on as-needed basis. refer following apple support article more information on how understand activity monitor readings.
 


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