TestOut LabSim A+ Certification Practice Exam

What is the approximate bus speed of DDR2 memory rated at PC2-5300?

1. 266 MHz

2. 333 MHz

3. 400 MHz

4. 533 MHz

The correct answer is: 333 MHz

The approximate bus speed of DDR2 memory rated at PC2-5300 is indeed based on its designation. In this case, PC2-5300 indicates that the memory has a bandwidth of 5300 MB/s. To determine the bus speed, you can use the relationship between the memory clock speed and the effective data rate that DDR (Double Data Rate) memory utilizes. For DDR2, the theoretical bandwidth can be calculated by dividing the rated bandwidth (in MB/s) by 8 (to convert to bytes): 5300 MB/s ÷ 8 = 662.5 MB/s Next, since DDR memory transfers data on both the rising and falling edges of the clock signal, the bus speed is effectively half of the data rate. To find the actual clock speed, we can use the formula: Clock Speed = Effective Data Rate / 2 Calculating this for PC2-5300: 662.5 MB/s ÷ 2 = approximately 331.25 MHz Since bus speeds are typically rounded, and the closest frequency in the choices given is 333 MHz, this provides clarity as to why this is the most appropriate answer in the context of DDR2 memory. Thus, the choice indicating a bus