Can you use a DDR4 RAM in a DDR3 RAM slot?

You physically CANNOT put a DDR3 stick in a DDR4 slot They are physically keyed so they cannot be put in interchangeably If you did get it

DDR3 modules use 240 pins and DDR4 DIMMs use 288 pins Both DDR3 and DDR4 DIMMs are 5¼ inch in length but the pins in DDR4 are spaced closer

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ddr3 vs ddr4 slot DDR4 DDR4 3200 DDR4 2933 DDR4 2667 DDR4 2666 DDR4 2400 DDR4 2133 DDR3 DDR3 2133 slot line_back ALL FILTERS SATA 6Gbs RESET 10 x SATA 6Gb