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SODIMM - SODIMM Laptop Memory
A SO-DIMM, or small outline dual in-line memory module, is a type of computer memory built using integrated circuits.
SO-DIMMs (also written SODIMMs) are a smaller alternative to a DIMM, being roughly half the size of regular DIMMs. SO-DIMMS are often used in systems which have space restrictions such as notebooks, small footprint PCs (such as those with a Mini-ITX motherboard), high-end upgradable office printers, and networking hardware like routers.
Most types of SO-DIMMs can be recognized at a glance by the distinctive notches. 100-pin SO-DIMMs have two notches, # 144-pin SO-DIMMs have a single notch near (but not at) the center, and # 200-pin SO-DIMMs have a single notch nearer to one side. The 200-pin SO-DIMM notch is in one of two locations. If the notch is located away from the center, it indicates the DDR class of memory When the notch is located nearer the center of the board, it generally (but not always) indicates that the RAM is of the DDR2 type. These two types of memory are not interchangeable. The different notch locations are designed to prevent cross-installation. Keep this in mind when attempting to visually identify 200-pin SO-DIMM modules.