Specifications
iMac (21.5-inch, Mid 2014) computers are configured with 8 GB LPDDR3 SDRAM installed in two channels integrated to the main logic board.
Memory replacement
The memory for iMac (21.5-inch, Mid 2014) computers are not user-accessible and is integrated into the main logic board. Visit an Apple Retail Store or Apple Authorized Service Provider if you need to service or replace your computer's SDRAM.