Data Rate is the number of times per second (frequency) that a module sends and receives data.All memory in the system is synchronized by an external clock generator.

Dynamic means that each of the cells must be continuously refreshed to prevent data loss, as opposed to static memory which is typically much slower. Random simply means that the memory controller doesn’t need to read the entire row to parse the data from the relevant column. Organized in rows and columns of cells in a similar manner to a spreadsheet (or very large table), Random Access Memory is able to access any of those cells in whatever order is instructed by the memory controller. SDRAM stands for Synchronous Dynamic Random-Access Memory.Some compact desktop boards use SODIMMs, typically (but not exclusively) to make room for four modules on a motherboard design that might otherwise only support two. DIMM stands for dual inline memory module: Today’s DIMMs have two 64-bit interfaces, one on each side, and are generally sold as either UDIMMs (aka DIMMs, long DIMMs, etc) for desktop or SODIMMs (small outline DIMMs) for notebooks.But unless you’re working with a system that’s several years old at this point, you’ll probably be dealing with DDR4. Most of the terms we’re using today also apply to previous generations of memory. We’ll focus today on DDR4 because that’s where the industry has standardized over the last four or five years.

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