COMPTIA A+ Practice Exam

What bus speed is supported by PC-2700 DIMMs?

1. 150MHz

2. 167MHz

3. 200MHz

4. 266MHz

The correct answer is: 167MHz

PC-2700 DIMMs support a bus speed of 167MHz. The naming convention for PC-2700 indicates that it is a type of DDR memory module capable of achieving a peak transfer rate of 2700 MB/s. To calculate the bus speed supported by a DDR memory module, we need to divide the peak transfer rate by 8 (since DDR memory transfers data twice per clock cycle). In this case, 2700 MB/s divided by 8 equals 337.5 MHz. However, the effective bus speed is half the clock speed because of the double data rate nature of DDR memory, resulting in the supported bus speed of 167MHz. Option A is incorrect because 150MHz is not the correct bus speed for PC-2700 DIMMs. Option C is incorrect because 200MHz is not the correct bus speed for PC-2700 DIMMs. Option D is incorrect because 266MHz is not the correct bus speed for PC-2700 DIMMs.