What Will Happen If You Plug In a DDR3 into a DDR4 Motherboard

So it just uses the memory slot as a physical anchor to hold the SSD adapter? This has to be in

Memory * 8 GB: 1 x 8 GB, DDR4, 2666 MTs Storage 512 GB, , PCIe NVMe 1 2230 slot for WiFi and Bluetooth card 1 22302280 slot for solid

ddr4 slot Memory * 8 GB: 1 x 8 GB, DDR4, 2666 MTs Storage 512 GB, , PCIe NVMe 1 2230 slot for WiFi and Bluetooth card 1 22302280 slot for solid

ddr4 sodimm slot No, you can't use DDR3 on a board that has DDR4 memory slots only They won't fit and won't work