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Also known as dual in-line memory module, dual inline memory module

thumb|Two types of DIMMs: a 168-pin SDRAM module (top) and a 184-pin [[DDR SDRAM module (bottom). The SDRAM module has two notches (rectangular cuts or incisions) on the bottom edge, while the DDR1 SDRAM module has one. Also, each module has eight RAM chips, but the lower one has an unoccupied space for the ninth chip; this space is occupied in ECC DIMMs.]]