These are divided into 3 banks, and each bank consists of four 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.ġ2 sockets (3 banks of 4) This indicates that there are 12 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.Ĩ sockets (4 banks of 2) This indicates that there are 8 memory slots. These are divided into 2 banks, and each bank consists of two memory slots. So you can add memory one piece at a time for the system to use.Ĥ sockets (2 banks of 2) This indicates that there are 4 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.ģ sockets (3 banks of 1) This indicates that there are 3 memory slots. These are divided into 2 banks, and each bank consists of one memory slot. :Ģ sockets (2 banks of 1) This indicates that there are 2 memory 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.

The Apple iMac 27-Inch (Late 2013) has 4 Sockets memory expansion slots. Memory Sockets or Slots are the place where memory RAM modules are inserted in the motherboard.

Late 2013 imac 27 upgrade memory