DDR-SDRAM, sometimes called "SDRAM II," can transfer data twice as fast as regular SDRAM chips. This is because DDR memory can send and receive signals twice per clock cycle. The efficient operation of DDR-SDRAM makes the memory great for notebook computers since it uses up less power.

What is the purpose of DDR?

Double data rate (DDR) is the advanced version of synchronous dynamic random access memory (SDRAM). SDRAM waits for clock signals before responding to control inputs. DDR uses both the falling and rising edges of the clock signal.

How does DDR memory work?

DDR works by taking a driven clock - front side bus frequency usually and modified by multipliers/divisors, enabling it to run to its rated frequency - and outputting two bits of data onto the memory bus from the DRAM's I/O buffers, per driven clock cycle.