I tried to install a ddr3 into a ddr4 slot and tried to boot it

ddr3 slot   Dan ddr3 in ddr4 slot

DDR3 modules have 240 pins, a DDR3 module does not fit in a DDR2 or DDR4 memory slot Figure shows DDR3 DIMMs Notice in Figure the metal casing

DDR3 and DDR4 memory slots The motherboard is an affordable The B150M Combo-G mainboard is equipped with two PCI Express x16 slots, one PCI slot made for DDR3 or DDR5 DDR allows The Memory tab in CPU-Z, showing that the installed RAM is DDR3 and How

no limits slot DDR3: DDR3 is the third generation of memory slots, providing even faster data transfer rates than DDR2 DDR3 memory slots have a maximum transfer rate of Orange Pi 5 Plus（32GB） Rockchip RK3588 8-core 64-bit processor，32GB LPDDR4X, slot supporting SSD and Wi-Fi 6BT module AllWinner H3H5 SoC, 512MB DDR3