What are restrictions on adding memory

IMac with 4GB memory (2x2GB in two slots)
can I add 2x4GB in remaining slots for total10GB memory

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In North America contact OWC …        Upgrade Apple iMac Memory
In Europe contact Crucial.com  …       RAM Memory Upgrade
Both companies have facilities to guide you and will recommend the correct memory package to meet whatever needs you describe to them.  
There may be benefits buying from your own geographical location insofar as Shipping charges, Local sales taxes and Exchange rates.  Check out the basic memory costs and do your sums.
Guide to required RAM.    Lookup Mac Specs By Serial Number, Order, Model & EMC Number, Model ID @ EveryMac.com

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