Is DDR4 RAM compatible in a DDR3 RAM slot?

Explanation of differences between DDR3 & DDR4 RAM modules ddr4 slot DDR4 RAM Slot & 1 SATA SSHD Slot 3 Years Warranty+2 Years Extended Warranty Up to 16GB DDR4 SO-DIMM memory support; ddr4 sodimm slot H610M H DDR4 · Supports Intel® Core™ 14th 13th 12th processors · Dual Channel Non-ECC Unbuffered DDR4, 2 DIMMs · 6+1+1 Hybrid Digital VRM Design

ddr4 vs ddr5 slot slot Finally, DDR5 has 288 pins as DDR4 does but is keyed differently so that DDR4 DDR4 DDR5 FIGURE DDR4, DDR3, and DDR2 DIMMs FIGURE DDR3