Question: will ddr3 fit in ddr4 slot?
Answer: A motherboard with DDR4 slots cannot use DDR3, and you can't put DDR4 into a DDR3 slot. ... It doesn't sound like much, and there are low voltage DDR3L modules as well as enthusiast DDR4 modules where voltages overlap, but the standard modules are 1.2V vs. 1.5V.