DDR1 and DDR2

hello friends
DDR1 & DDR2 not clearly explain but oldest mother board is used to DDR1 e.g. Mother board series is Intel 845 GVSR but latest mother board is used to DDR 2 in that different is RAM Chiip notch is both are different position.

DDR1 Memory
184-pin DIMM/ 200-pin SODIMM
& DDR2 Memory >> 240-pin DIMM/ 200-pin SODIMM
Speed >>
DDR1] 200, 266, 333, 400
2] 400, 533, 667MHz

regards
Sarang

One more differences

DDR (Double Data Rate)

1. DDR1 is 184 Pin and DDR2 is 240 Pin.

2. DDR2 is much more faster than DDR1