However, the pre fetch buffer in DDR3 can transfer data eight times per clock cycle. DDR3 allows data transfer twice per clock cycle similar to other forms of DDR. In DDR3 lowest heat level is reached, so that the system will run cooler compared to DDR2. The operating volume for DDR3 is 1.5V where as it is 1.8V for DDR2. The major benefit of DDR3 is higher performance with lower power consumption. DDR3 starts up at a lowest speed level of 800MHz and the maximum is 1600MHz, provided the bus speed is as high as 2000MHz. The pre fetch buffer allows a data transfer of four times per clock cycle.ĭDR3 RAM is the third generation in the DDR group of RAMs. DDR2 achieves performance gain using a pre fetch buffer which is used to retrieve four data words per memory access. But there is definitely an advantage that returns to DDR2 when the speed reaches 532MHz which is the next step, DDR1 cannot reach this state. Because of different latencies a 400MHz DDR1 will outperform a 400MHz DDR2. DDR2 has a lowest speed level of 400MHz available as of now which was the highest speed level for its predecessor DDR1 RAM. DDR2 RAM is the second generation among all others in the DDR RAM family.
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