Which of the following is correct about the DDR speed rating of DDR400 RAM?
A) It has a clock speed of 800 MHz.
B) It has a clock speed of 400 MHz.
C) It has a clock speed of 100 MHz.
D) It has a clock speed of 200 MHz.

Question

Quizplus · Accepted Answer

DDR400 RAM has a clock speed of 200 MHz, but because DDR (Double Data Rate) RAM transfers data on both the rising and falling edges of the clock signal, it effectively doubles the data rate, resulting in an effective speed of 400 MHz.

Which of the Following Is Correct About the DDR Speed