Is DDR4 RAM compatible in a DDR3 RAM slot?

Key difference between DDR4 and DDR3 RAM can i put ddr3 in ddr4 slot It's very easy to install ddr4 ram into your PC, but it will be ram you typically will want to can i use pcie 40 in 50 slot It's very easy to install ddr4 ram into your PC, but it will be ram you typically will want to

can i run a pcie 40 in 30 slot This video gives you answers of: ○ DDR4 in DDR3 slot ○ DDR3 1600Mhz in DDR3 1333Mhz