Is DDR4 backward compatible with DDR3, DDR2 and DDR1?

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All DDR memories are mutually incompatible. The DDR2/3/4 DIMMs can only be used on their respective DDR2/3/4 sockets, with the notches differently located. The power supply for each generation also varies: for DDR1 DIMMs, it's 2.5V; DDR2, 1.8V; DDR3, 1.5V; and DDR4, 1.2V.

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Is DDR4 backward compatible with DDR3, DDR2 and DDR1?

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