Inspiron 15 3565 Spare DDR4 DIMM B Ram slot question

Doubling bandwidth and density with improved performance and power efficiency, DDR5 DIMM socket DDR4 DIMM Sockets Meeting JEDEC specifications, these high-

I tried putting this into the empty DDR4 DIMM B slot, but the connector didn't line up correctly as this Ram stick is DIMM A, and so had to

ddr4 slot DDR4 SO DIMM memory sockets provide about 30% better performance than DDR3 SO DIMM memory sockets while consuming about 70% less power The connectors

ddr4 and ddr5 same slot English: A slot for DDR4 SO-DIMMs RAM on a mainboard Deutsch: Ein Slot für DDR4 SO-DIMMs (Small Outline Dual Inline