Which of the following are the differences between ddr3 sdram and ddr2 sdram? ddr3 transfers data at twice the rate of ddr2. ddr3 uses 240-pin connections and ddr2 uses 120-pin connections. ddr3 memory power consumption is 30% less as compared to ddr2. ddr3 transfers data on a 64 data bits wide bus and ddr2 transfers data on a 128 data bits wide bus.

DDR3 SDRAM having twice rate of data transferring as compared to DDR2 SDRAM both have 240 pin connection. DDR3 memory power consumption is 40 % less as compared to DDR2. both are transfers data on a 64 data bits wide bus. The physical difference occur in both type a cut is present at bottom along pin in DDR2 it is occur probably in center and In DDR3 it is occur at left  through center.

1. entrepreneur.com

2. wikipedia