New Alder Lake motherboard supports both DDR4 and DDR5 memory

In this short we explain that you cannot install DDR5 memory into a DDR4 slot , we also

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ddr5 slot compatible with ddr4 No The sticks are physically different DDR4 wont fit in a DDR5 slot and vice versa

ddr5 in ddr4 slot This applies to DDR5 and DDR4 memory modules DIMMs Definitions One DIMM per channel board design means one DIMM slot per channel (see bottom right