TheresDDR4, DDR5, and their predecessors.
The most common form factors are DIMM, SODIMM, and MicroDIMM.
DIMM stands for Dual Inline Memory Module.

Since the aforementioned form factors all have the word DIMM in them, these are all dual inline modules.
They are relatively larger in size than the SODIMM and MicroDIMM modules.
These are 133.35 mm (5.25 inches) in length.

DIMMs started out with a 100-pin configuration the copper connectors you see toward the bottom of the modules.
SODIMM
SODIMMs are slightly smaller modules than DIMMs.
The width of the modules is the same.

SODIMMs started out with 144 pins, but now have a 262-pin configuration in a DDR5 module.
MicroDIMM
MicroDIMMs have only been iterated to DDR2.
These are even smaller than SODIMMs and primarily used in printers and other non-memory-invasive devices.

MicroDIMMs started out with 144 pins and now have 214 pins on the same form factor module.
Here is how:
fire up the Task Managerby pressing the CTRL + Shift + Esc shortcut keys.
Switch to thePerformancetab.launch the Performance tab in Task Manager
Open theMemorytab inside the Performance tab.

If you get the wrong form factor for your machine, it will be money wasted.
Hence, make informed decisions.
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source: www.itechtics.com