SO-DIMM
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SO-DIMM is an abbreviation for Small Outline Dual In-line Memory Module and is a type of computer memory integrated circuit.
They 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 72 pins (supporting 32-bit data transfer) or 144 pins or 200 pins (both supporting 64-bit data transfer). This compares to regular DIMMs that have 168 pins and support 64-bit data transfer.