Is DDR4 backward compatible with DDR3, DDR2 and DDR1?

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Every DDR generation is different from the others DDR4 is not backward-compatible with DDR3 so a DDR4 DIMM will not fit on a DDR3 DIMM slot

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can you put ddr3 in a ddr4 slot DDR5 has about the same latency as DDR4 and DDR3 DDR5 octuples the maximum DIMM capacity from 64 GB to 512 GB DDR5 also