Which of the following are differences between Double Data Rate SDRAM (DDR SDRAM) and Double Data Rate 2 SDRAM (DDR-2 SDRAM)? (Choose all that apply)
A.
Double Data Rate 2 SDRAM (DDR-2 SDRAM) can transfer data on both the leading and falling edges of each clock cycle while Double Data Rate SDRAM (DDR SDRAM) can transfer data only on the leading edge of each clock cycle.
B.
Double Data Rate 2 SDRAM (DDR-2 SDRAM) has a larger maximum bandwidth that Double Data Rate SDRAM (DDR-SDRAM).
C.
Double Data Rate 2 SDRAM (DDR-2 SDRAM) consumers more power than Double Data Rate SDRAM (DDR-SDRAM).
D.
Double Data Rate 2 SDRAM (DDR-2 SDRAM) has 240 pins while Double Data Rate SDRAM (DDR-SDRAM) has 184 pins.
Explanation:
DDR-2 SDRAM has a larger maximum bandwidth that DDR SDRAM. DDR-2 SDRAM is not compatible with DDR SDRAM because DDR-2 SDRAM uses 240 pins per module while DDR SDRAM uses 184 pins Incorrect Answers: A: DDR SDRAM as well as DDR-2 SDRAM can transfer data on both the leading and falling edges of each clock cycle, which doubles the data transfer rate of traditional Single Data Rate SDRAM (SDR SDRAM).
C: DDR-2 SDRAM consumers less power than DDR SDRAM because it uses less voltage than DDR SDRAM References: Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 89-95.