SO-DIMM

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Image:SODIMM.jpg A SO-DIMM, or small outline dual in-line memory module, is a type of computer memory integrated circuit.

SO-DIMMs are a smaller alternative to a DIMM, being roughly half the size of regular DIMMs. As a result SO-DIMMs are mainly utilised in laptops, small footprint PCs (such as those with a Mini-ITX motherboard) and high-end upgradable office printers.

SO-DIMMs have 100 pins (supporting 32-bit data transfer) or 144 or 200 pins (both supporting 64-bit data transfer). This compares to regular DIMMs that have 168 pins and support 64-bit data transfer.

The different types of SO-DIMMs can be recognized at a glance by the distinctive notches used to "key" them for different applications: 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.

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