Specs for the new (late 2015) 27 inch iMac show 4 RAM slots. The 8GB basic 
setup uses 2 x 4GB modules. Apple upgrades are to 16GB or 32GB - using 8 GB 
modules.

Question 1:  Can RAM modules be user installed or are they factory fitted?

Question 2:  Can two more 4GB modules be user-fitted to create 16GB memory of 4 
x 4GB modules?

Question 3:  Can the RAM slots have a mix of 4GB and 8GB modules?

Regards
Alan
     Late 2012 iMac 27" Intel Quad Core i5  Fusion 3.2GHz 8G RAM - OSX 10.11.6 
El Capitan















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