How to determine DDR2 generation memory and ddr3 generation memory

1. Number of pins. </P> <p> the number of Gold finger pins in DDR memory is 184, while that in DDR2 memory and ddr3 memory is 240. </P> <p> 2. Memory particle shape. </P> <p> the size of the DDR memory is rectangular. The size of the DDR2 and ddr3 memory is square and much smaller than that of the DDR memory. </P> <p> 3. Prevents stay gaps. </P> <p> 3. The locations of the Memory Lock gaps are different. </P> <p> the DDR memory gap is behind the left 52 pins, and 40 pins are behind the gap. The DDR2 memory gap is behind the left 64th pins, and 56 pins are behind the gap. The ddr3 gap is behind 72 to the left, and there are 48 to the back of the gap. The gap is right than that of DDR2 memory. <Br/>