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

Why do RAM sticks need to be separated in the DIMM slots? slot dimm DDR3 DIMM with DIMM Slot PNG images & PSDs for download with transparency Rotate this 3D object and download from any angle slot circus DIMM is the evolution of SIMM Dual in-line memory module is faster and cooler -- literally

slot circus DIMM is the evolution of SIMM Dual in-line memory module is faster and cooler -- literally

slot sites denmark Is there a Cisco IOS command that will show DIMM info per slot? I have a Cisco 2811 with 256MB DRAM I know this because show version tells me Biostar ; 1, 1 x AMD Socket AM4 CPU ; 2, 4 x DIMM DDR4-4933+ ; 3, 4 x SATA III Connectors ; 4, 1 x PCIe x4 Slots ; 5, 1 x PCIe x4 Slots