Is DDR5 backwards compatible with DDR4?

website ddr4 slot vs ddr5 Also, there are two independent 40-bit channels per memory DIMM, whereas DDR4 only has one 72-bit channel Furthermore, DDR5 memory has managed ddr4 in ddr3 slot DDR4 vs DDR5: What's the Difference? ; Power Management, Handled by Motherboard, Handled by on-DIMM PMIC ; Channel Architecture, 72-bit bus 1

ddr4 slot vs ddr5 DDR5 standards require a IO voltage— volts lower than DDR4's requirement While this might seem like a minute decrease, the  Motherboard ddr4 : XeZX MSI B660M Mortar Wifi Motherboard  Micron DDR5 DRAM memory is available in 163264GB and 244896GB capacities Will DDR5 server memory modules fit into a DDR4 socket?

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