ddr2 in ddr3 slot - Amazon.com: N5105/N6005 NAS Demon Board ITX 6xSATA3.0 2xM.2 NVMe ... slot mega 888

S$20 | Type: 8GB DDR3 SO-DIMM Laptop memory 1333MHz / 1600MHz Function: Non-ECC Frequency: PC3-12800S 1600MHz DDR3 Module specifications: 204pin Memory ...

First of all, a DDR3 laptop RAM module can’t physically fit into a DDR4 laptop RAM slot and vice versa. Notches on the connectors of memory sticks are on different places.

So, it becomes impossible to fit DDR3 in the DDR4 slot and vice versa.