DDR2 SDRAM is the second generation of DDR SDRAM.DDR2 SDRAM improves on DDR SDRAM by using differential signaling and lower voltages to support significant performance advantages over DDR SDRAM.Differential signaling requires additional contacts, so the number of contacts on a DDR SDRAM DIMM module was raised from 184 to 240.The voltage of DDR SDRAM DIMM's was lowered from 2.5V to 18.V. This improves power consumption and heat generation, as well as enabling more dense memory configurations for higher capacities.
DDR SDRAM is Double Data Rate SDRAM.DDR SDRAM is an improvement over regular SDRAM, also known as SDR SDRAM (Single Data Rate SDRAM).DDR SDRAM doubles the bandwidth of SDR DRAM by transferring data twice per cycle on both edges of the clock signal, implementing burst mode data transfer.
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