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Memory Upgrade for Apple iMac (Retina 5K, 27-inch, Late 2015)

Apple iMac (Retina 5K, 27-inch, Late 2015) memory upgrade specification, iMac (Retina 5K, 27-inch, Late 2015) maximum memory, memory speed, and memory upgrade options.

Upgrade memory on Apple iMac (Retina 5K, 27-inch, Late 2015) upto a maximum of 32GB
DDR3L PC3L-14900 1866MHz SODIMM, with maximum 8GB per slot in 4 Slots memory slots. The Apple iMac (Retina 5K, 27-inch, Late 2015) takes the DDR3L PC3L-14900 1866MHz SODIMM Memory Type.

Apple iMac (Retina 5K, 27-inch, Late 2015) Memory Upgrade Specification
Standard Memory Maximum Memory Memory Expansion CPU Type Model/Chipset
8GB 32GB
DDR3L PC3L-14900 1866MHz SODIMM
4 Slots
 

Apple iMac (Retina 5K, 27-inch, Late 2015) Memory Upgrade options.

What are memory sockets or slots and how are these divided into bank?

 

Memory Sockets or Slots are the place where memory RAM modules are inserted in the motherboard. The Apple iMac (Retina 5K, 27-inch, Late 2015) has 4 Slots memory expansion slots. A memory bank is a group of memory expansion sockets, a bank must be completely filled with memory modules of the same size and type in order for the system to recognize and address the memory. i.e. :

2 sockets (2 banks of 1) This indicates that there are 2 memory slots. These are divided into 2 banks, and each bank consists of one memory slot. So you can add memory one piece at a time for the system to use.

3 sockets (3 banks of 1) This indicates that there are 3 memory slots. These are divided into 3 banks, and each bank consists of one memory slot. So you can add memory one piece at a time for the system to use.

4 sockets (2 banks of 2) This indicates that there are 4 memory slots. These are divided into 2 banks, and each bank consists of two memory slots. So you must add memory two pieces at a time (they must be the same size and type of memory) in order for the system to benefit from the upgrade.

8 sockets (4 banks of 2) This indicates that there are 8 memory slots. These are divided into 4 banks, and each bank consists of two memory slots. So you must add memory two pieces at a time (they must be the same size and type of memory) in order for the system to benefit from the upgrade.

12 sockets (3 banks of 4) This indicates that there are 12 memory slots. These are divided into 3 banks, and each bank consists of four memory slots. So you must add memory four pieces at a time (and they must be the same size and type of memory) in order for the system to benefit from the upgrade.