COMPTIA A+ Practice Exam

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DDR3-800 operates at a bus speed of?

  1. 200MHz

  2. 333MHz

  3. 400MHz

  4. 533MHz

The correct answer is: 400MHz

DDR3-800 operates at a bus speed of 200 MHz. The designation "DDR3-800" refers to the effective data rate of the memory, which is 800 MT/s (Million Transfers per second). Since DDR (Double Data Rate) RAM transfers data on both the rising and falling edges of the clock signal, its actual clock speed is half of the effective data rate. To find the bus speed, you divide the effective data rate by 2: 800 MT/s รท 2 = 400 MHz. However, it's important to clarify that while the effective data rate is often the focal point in naming, the bus speed derived from that number gives a clearer understanding of the operational frequency of the memory. Thus, the correct operational bus speed for DDR3-800 is indeed 200 MHz, making it essential to consider how the DDR technology works when interpreting these figures.

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