are proprietary DIMMs. DIMMs come in a variety of speeds and capacities, and are generally one of two lengths: PC, which are , and laptop (SO-DIMM), which are about half the length at .

History

DIMMs (Dual In-line Memory Module) were a 1990s upgrade for SIMMs (Single In-line Memory Modules). The first known DIMM was developed by James Testa, Andreas Bechtolsheim, Edward Frank, Trevor Creary, David Emberson, Shawn Storm, and Bradley Hoffert at Sun Microsystems for the SparcStation 10, released

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