Which of the following is FALSE about DDR2 and DDR3 RAM?

Which of the following is FALSE about DDR2 and DDR3 RAM?

• DDR3 uses less power than DDR2
• DDR3 has fewer pins than DDR2
• DDR3 is not backwards compatible with DDR2
• DDR3 is faster than DDR2 

 

EXPLANATION

DDR3 is the successor to DDR2 memory technology. There are several differences between them. DDR3 is not backwards compatible with DDR2. While both types of modules have the same numbers of pins, the notches in the PCB are in different locations. In other words, a DDR3 module cannot be placed in a DDR2 memory socket, and vice-versa.

DDR3 modules run on 1.5V compared to the 1.8V that DDR2 modules require. The DDR3 decrease in voltage results in less power consumption and greater energy-efficiency at comparable speeds.
DDR3 is faster. DDR2 "JEDEC standard" memory typically stops at around 800MHz whereas the introductory speeds of DDR3 when it was released in 2007 started at 800MHz and is far faster than that now.