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 used in laptops, small footprint PCs (such as those with a Mini-ITX motherboard) and high-end upgradable office printers.

SO-DIMMs have 100, 144, or 200 pins. The 100 pin package supports 32-bit data transfer, while the 144 and 200 package supports 64-bit data transfer. This compares to regular DIMMs that have 168 pins, supporting 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.

SO-DIMMs are more or less equal in power and voltage to DIMMs, and as memory technology moves forward, both SO-DIMMs and DIMMs are available in equal speed (PC3200, for example, and clock speeds such as 2.0, 2.5 and 3.0 CAS latency) and capacity (512MB, 1GB, etc.).

External links

• How to Install PC Memory Guides

Computer memory

Small Outline Dual Inline Memory Module | SO-DIMM | SO DIMM | SO DIMM | SO-DIMM