Learn in the textbookMemory Hierarchy and DRAM Standards & Modules
DefinitionDDR3 SDRAM is a DRAM standard used for main memory and the third generation of the DDR SDRAM series.
ExplanationSDRAM is DRAM that works in sync with a clock signal that sets the timing of operations. DDR (Double Data Rate) sends data on both the rising and falling edges of the clock, transferring twice per cycle, and DDR3 is its third generation.
AnalogyIf you take a step on both the tick and the tock of a metronome, you cover twice the steps at the same tempo.
Memory hookThe Double in DDR means "twice per beat". The number after it is the generation, not a capacity or a module count.