Is DDR4 RAM compatible in a DDR3 RAM slot?

can you put ddr3 in ddr4 slot   Dan can you use a pcie 40 nvme in a 30 slot

You will have to replace the motherboard, CPU and RAM all at the same time New mobos don't use DDR3, your current CPU will not fit in modern

No They don't even fit in the same slots There were a very few motherboards that had DDR4 and DDR3 slots, but you could only use one No, DDR4 RAM modules are not compatible with double data rate 3 random access memory or DDR2 slots DDR4 RAM uses a different physical slot and pin

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