DDR3 uses lower voltage
DDR3 uses less power than DDR2
DDR3 uses lower voltage
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DDR3 uses 1.5V; DDR2 uses either 1.8V or 2.5V
DDR3 runs on lower voltage, uses less power, has a frequency of 800-2000MHz (DDR2: 400-1066MHz, DDR: 200-600MHz)and the "prefetchbuffer" is 8 bits instead of DDR2's 4 bits and DDR's 2 bits. DDR3 is the only one that has the 90 nm technology.
they are different ram generations. DDR2 is the older and slower version of DDR3. DDR2 is about 800 MHz max. and DDR3 is about 1333 MHz minimum
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DDR3
DDR2 is slower than DDR3 due to their difference in bandwidth. DDR3 has a higher bandwidth hence can transfer data at higher speeds than DDR2.
It is not very noticeable if you upgrade your memory on your computer.
DDR3 runs at higher clocks and lower voltages due to a more complex 90nm manufacturing process than DDR2 Ram. So therefore, DDR3's main difference in comparison to DDR2 is better power usage and higher clock speeds.
DDR3 memory provides a reduction in power consumption of 30% compared to DDR2_SDRAMmodules due to DDR3's 1.5 V supply voltage, compared to DDR2's 1.8 V or DDR's 2.5 V.
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