Question: what are ddr1 ddr2 and ddr3?
Answer: DDR2 533 and DDR2 800 memory types are on the market. DDR3 SDRAM(Double Data Rate Three SDRAM): DDR3 memory reduces 40% power consumption compared to current DDR2 modules, allowing for lower operating currents and voltages (1.5 V, compared to DDR2's 1.8 V or DDR's 2.5 V). The transfer rate of DDR3 is 800~1600 MT/s.