Is DDR4 RAM compatible in a DDR3 RAM slot?

Is DDR4 RAM compatible in a DDR3 RAM slot? ddr3 slot First of all, a DDR3 laptop RAM module can't physically fit into a DDR4 laptop RAM slot and vice versa Notches on the connectors of memory ddr3 in ddr4 slot DDR3 DDR3 2400 DDR3 2200 DDR3 2133 DDR3 1866 DDR3 1800 DDR3 1600 DDR3 1333 1 Slot 1x288pin Others 12x288pin 6x240pin line_back ALL

ddr3 in ddr4 slot CPU Socket All, SP6, SP5, SP3, G34, FT3, C32, AM5, AM3+ Socket Count All, 1P DDR3 Memory Channels All, 12, 8, 6, 2 System Memory Specification All, Up

ddr3 vs ddr4 slot Xllbyte New Sealed SODIMM DDR2 2GB Memory for Laptop RAM 533mhz · Kllisre DDR3 DDR4 8GB 4GB 16GB Laptop Ram 1333 1600 2400 2666 3200 DDR3L 204pin 2 Slot, Audio, DDR3 1600 MHz, Ports ZEB0NICS H81 4th5th Generation Micro ATX Motherboard II LGA1150 DDR3 Socket Supports