Is DDR4 backward compatible with DDR3, DDR2 and DDR1?

does ddr3 fit in ddr4 slot   Dan does ddr4 fit in ddr5 slot

DDR4 DDR3 DDR5 DDR6X DDR6 Search Reset Desktop image1 image2 · Quick view The GIGABYTE C301 GLASS WHITE can fit up to E-ATX motherboards, up to seven

DDR3 Memory · iCUE RGB Memory · Mac Memory · Laptop Memory FEATURES VENGEANCE® LPX 64GB DDR4 DRAM 3200MHz C16 Memory Kit DDR4 DDR3 DDR5 DDR6X DDR6 Search Reset Desktop image1 image2 · Quick view The GIGABYTE C301 GLASS WHITE can fit up to E-ATX motherboards, up to seven

slot checker app With major changes to its physical design, specifications, and features, motherboards with DDR4 slots cannot use DDR3 RAM, and DDR4 RAM can't be DDR4 RAM is not backwards compatible with DDR3 motherboards and vice versa The notch has been moved to prevent accidental insertion of the