DDR3 vs DDR4 Dual vs Quad channel RAM configuration

You Need To Know About DDR3 and DDR4 Memory ddr3 in ddr4 slot Every DDR generation is different from the others DDR4 is not backward-compatible with DDR3 so a DDR4 DIMM will not fit on a DDR3 DIMM slot ddr3 vs ddr4 slot No, you can't use DDR3 on a board that has DDR4 memory slots only They won't fit and won't work

ddr3 in ddr4 slot No There are some, for Skylake only, that support *either* DDR3 or DDR4 RAM But, there's a huge catch: It has to be DDR3L