Can i use ddr4 ram with another ddr3 ram

How to Install DDR4 Memory can i put ddr3 in ddr4 slot install DDR5 RAM into a motherboard that only accepts DDR4 Remember, DDR memory is not backward compatible, so you can't install DDR5 to a DDR4-based candy witch 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

can you put a gen 4 ssd in a gen 3 slot No, you can't use DDR3 on a board that has DDR4 memory slots only They won't fit and won't work