According to MacTracker: Maximum memory: 32 (actual) 16GB (apple)
what does this mean?
Yes it supports up to 16 GB (4 x 4 GB).
Some of the users have tried 4 x 8 GB ( 32 GB) in the same iMac and it has worked. So it may or may not work for you (Unofficial). 16 GB (4 x 4 GB) Official.
According to MacTracker: Maximum memory: 32 (actual) 16GB (apple)
what does this mean?
Yes it supports up to 16 GB (4 x 4 GB).
Some of the users have tried 4 x 8 GB ( 32 GB) in the same iMac and it has worked. So it may or may not work for you (Unofficial). 16 GB (4 x 4 GB) Official.