DDR2 SDRAM

Second generation DDR memory provides greater bandwidth and other new features such as On-Chip Termination (OCT). 4 bits of data are moved from the memory array to the I/O buffers (per data line) each core cycle. This can be described as 4-bit prefetch, as opposed to the single-bit fetch in SDRAM and 2-bit prefetch with DDR SDRAM. DDR2 is the dominant mainstream system memory product today, and is replacing DDR in the desktop DRAM market. DDR2 memory modules are 240-pin DIMMs.