They LIED to me! - DDR4 RAM to SSD Adapter

Every DDR generation is different from the others DDR4 is not backward-compatible with DDR3 so a DDR4 DIMM will not fit on a DDR3 DIMM slot

Try starting with one dimm in slot 2, boot the PC, shut down and insert the second dimm in slot 4, and see if you can boot

slot server kamboja 16GB DDR4 on board RAM expandable upto 32GB using 1x DDR4 SO-DIMM slot; Storage: 512GB NVMe PCIe SSD; Graphics: Discrete 6GB GDDR6 NVIDIA GeForce RTX

slot xocom : ram slot for pc XPG ADATA GAMMIX D30 DDR4 8GB 3200MHz U-DIMM Desktop Memory - AX4U32008G16A-SR30