Visual Identification
Most 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. The exact location of this notch varies (read below.)
- 204-pin SO-DIMMs (DDR3) have a single notch closer to the center than on 200-pin SO-DIMMs.
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