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WHAT IS THE DIFFERENCE BETWEEN DDR2 AND DDR3 MEMORIES ARE THEY COMPATIBLE?
Though the DDR3 module is developed based on the DDR2 and also uses the 240-pin design, both the pin layout and signal definition of the DDR3 module are different. The difference is also seen in the fool-proof cut on the gold finger. Therefore, they are not compatible. Moreover, the DDR3 has enhanced I/O buffer performance by means of the 8-bit prefetch technology. Therefore, it can break through the clock speed limit of the DDR2 module. As a result, the data rate of the DDR3 module begins from 800MHz, and it will increase to DDR3-1066, DDR3-1333, and DDR3-1600 in the future.
