How do I identify DDR1, DDR2,DDR3 RAM for pc?

How do I identify DDR1, DDR2,DDR3 RAM for pc? it doesn't outright say the DDR type. DDR: PC-1600 to PC-3200 DDR2: ... How to identify the types of rams physically - What is the difference between DDR, DDR2, DDR3 ... 6How to identify DDR3 and DDR4 RAM physically ...

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