DDR3 offers a substantial performance improvement over previous DDR2 memory systems New DDR3 features all transparently implemented in the memory controller,DDR3 improve the signal integrity characteristics of DDR3 designs soo that higher performance is achieved without an undue burden for the system designer. If proper consideration is given to any new DDR2 memory design it can be a relatively easy upgrade to support DDR3 in the next generation design This paper identified the key differences between DDR2 and DDR3 and illustrated some of the key issues that need to be addressed to easy migration toDDR2cpu