In the spec sheet, look under the memory subcategory to find the type of RAM and the original RAM frequency in MHz your notebook takes.
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User Manual: You will typically find your laptop's motherboard specifications in the user manual.How Do I Determine Compatibility With My System? They do this through a key system that involved physical notches about an inch from the left of the module that should fit exactly into the key or protrusion in a compatible motherboard. DDR3 SODIMM RAM is physically designed in such a way as to prevent you from slotting it into the socket of an incompatible motherboard. It is the higher-speed successor to DDR2 and the predecessor to DDR4 memory. It is typically a type of unbuffered Non-ECC memory.
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They are shorter in width but are taller in height than regular DIMM RAM because they are mounted in such a way that the memory modules lay flat on the motherboard.