DDR (Double Data Rate) - Definition
DDR is an abbreviation for Double Data Rate, which is a computer acceleration tactic for data transmission also called “Dual-Pumping” or “Double Pumping.” The bus inside a DDR computer sends information during both halves of its clock cycle. This technique has been largely supplanted by a scheme called quad pumping, as used in the Pentium IV front side bus. The abbreviation DDR is also used in descriptions of the effective bandwidth of computer buses. For example, DDR400 transmits data at 400 Megahertz (2 * 200 Mhz). DDR essentially doubles the memory speed without increasing clock frequency.
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