Is DDR4 RAM compatible in a DDR3 RAM slot?

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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

RAM generations are not interchangeable You can only use DDR3 with DDR3, DDR4 with DDR4, and so on Can I Use an 8 GB RAM Stick and a Attempting to insert DDR4 RAM into a server motherboard designed for DDR3 is not feasible, just as DDR3 cannot fit into a DDR4 slot DDR3 vs

anak slot Attempting to insert DDR4 RAM into a server motherboard designed for DDR3 is not feasible, just as DDR3 cannot fit into a DDR4 slot DDR3 vs  Did you ever ask your self or just you like know this answer for DDR2 and DDR3 combination