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This varies wildly by the kind of memory. There are a few common structures, however.

Physically, there is some sort of I/O interface (input/output). This is usually a series of pins, which connect the RAM module to the computer.

There is also the RAM cells themselves, usually small square black 'chips' containing so many MB or GB of data each.

There is usually some sort of SPD or logic chip which identifies the RAM and it's default operating parameters, but is not always the case.

And there is always a memory controller, although this may not be on the RAM itself but is usually on the motherboard, or in the case of AMD, built into the CPU.

Logically, there are 'rows', 'columns', and 'banks'.

Rows and columns work just like a spreadsheet, and are used to access individual sectors inside the memory chips. This applies to each chip or bank on the memory.

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