Why do RAM sticks need to be separated in the DIMM slots?

dimm 2 slot   Dan dimm slot

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2: Defective DIMM slot If the DIMM slot is defective, it wont be able to detect the RAM stick This could be due to a manufacturing fault of That's an extra dimm slot that allows you to plug in an expansion card with 2 NVMe SSDs dimm-2-is-an-m-2-riser-card Upvote 1 Downvote

slot machine clip art Only DIMM Slots 1 and 3 work In image they are the two slots on the left with ram installed I can use either of the two or both at the 304230522242 B-Key + Micro SIM Slot; 2230 E-Key x 1; Onboard TPM DDR5 4000MHz DIMM x 4, Up to 128GB Non-ECC, Un-buffered Memory, Dual