DDR3 and DDR4 Laptop Memory Compatible? No

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 DDR3 2133 DDR3 1866 ASUS TUF GAMING B650-E WIFI AMD B650 AM5 ATX motherboard, DDR5, 8+2 teamed power stages, PCIe , a PCIe slot

ddr3 in ddr4 slot MAINBOARD LONGWELL H77 + CPU INTEL CORE I5 DDR3 Socket AM4 AMD A520 2xDDR4 1xPCIe 4xSATA Slot Micro ATX 1xD-Sub 1xHDMI 1xLAN 1Gb

ddr3 vs ddr4 slot Search by Memory Product Line ; Memory Type Memory Type DDR3 ; Speed · Speed · 1600MTs ; Total Capacity Total Capacity 4GB ; Kit Kit Single Module