What does the 72 tell you about the dimm?

The "72" in a DIMM (Dual In-line Memory Module) typically refers to the number of pins on the module. A 72-pin DIMM is an older type of memory module commonly used in older computers, particularly those that utilized EDO (Extended Data Out) or Fast Page Mode DRAM. This specification indicates the module's compatibility with certain motherboards and memory architectures, primarily in systems from the 1990s. Such modules are less common today, as modern systems generally use DIMMs with higher pin counts and more advanced memory technologies.