Can you use ddr3 in a ddr4 slot?

The DDR3 Slot latch is different from DDR4 RAM. And every DDR RAM slot is different, they are not backwards compatible. For example: You cannot insert DDR4 stick in DDR3 Slot, and vice versa. read more

solved DDR4 into a DDR3 slot. solved Odd issue, DDR4 ram on my Z170 motherboard works when only 2 Slots are filled; solved does gddr5 gpu work on ddr3 or ddr4 motherboard or RAM; solved Why is amd motherboards limited to 4 ddr3 slots; solved Using 3/4 DDR4 memory slots of motherboard; solved Will DDR3 RAM work in a DDR4 Motherboard and Processor. read more

DDR4 isn't bacwards compatible with DDR3. In other words, you can't use the newer DDR4 memory in an older DDR3 memory slot. If you are only wanting to upgrade the RAM, you can put another stick or a larger stick of RAM to slightly increase the performance of the computer. read more

DDR4 memories have far different design from DDR3. DDR4 have 288 pins architecture and that of DDR3 have 240 pin. Also the small nab in the slot that seperate the pins in two pieces and it helps that we are installing it in right way(I hope you will understand) is in different place. read more