What will happen if I mix DDR4 RAM and DDR5 RAM in my PC?

DDR5 and PCIe : What are they and what does it mean for gamers? ddr4 in ddr5 slot And you could get them in tall or short, right hand or left hand so you could fill 4x 72-pin slots with a total or 16x 30-pin simms from the ddr4 sodimm slot It's assumed only one slot will be active at a time, but this allows the board to work with both DDR4 and DDR5 RAM technology But also

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