What's the Difference Between DDR2, DDR3, and DDR4 RAM?

Does DDR3DDR2 RAM Work on DDR4 Motherboard? ddr3 vs ddr4 slot DDR3 RAM uses a 240-pin connector, whereas DDR4 uses a 288-pin connector A motherboard with DDR4 compatibility won't work with DDR3 RAM and ddr3 in ddr4 slot DDR4 SDRAM : DDR4 SDRAM provides the lower operating voltage and higher transfer rate The transfer rate of DDR4 is 2133~

ddr3 slot DDR3 and DDR4 standards use different pin sets in motherboards, so a motherboard compatible with DDR3 will not be compatible with DDR4 and vice