Is DDR4 backward compatible with DDR3, DDR2 and DDR1?

Is DDR4 backward compatible with DDR3, DDR2 and DDR1? ddr3 in ddr4 slot Attempting to use DDR3 in a DDR4 slot can lead to physical incompatibility, unstable operation, and potential damage to the memory module and ddr3 vs ddr4 slot Motherboard: Asus Prime B450M K II; Ram: 16GB DDR4 3200mhz; CPU Cooler: RGB Cooler; SSDNvme: 128GB SSD; Hard Drive: 500GB HDD; Power Supply: 600 Watts 80+

ddr3 vs 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 slot 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 Before you start, consider your motherboard's technology Is it DDR3 or DDR4? How many DRAM slots are available on the motherboard? Do modules have to be