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IT Support & Hardware · Foundational

Dual In-Line Memory Module (DIMM)

The standard desktop memory module with separate contacts on each side of the board.

Definition

DIMMs install vertically in motherboard slots and are secured with latches. Desktop DDR4 and DDR5 DIMMs have 288 pins, while DDR3 DIMMs have 240. Installation requires aligning the notch and pressing firmly until latches click.

Example

Press a DDR5 DIMM straight down until both slot clips lock.

Exam tip

DIMM = desktop; SO-DIMM = laptop/small form factor.

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