SODIMM

SODIMM stands for Small Outline Dual Inline Memory Module. It is a compact form factor of RAM designed for portable and small-footprint devices such as laptops, mini PCs, and all-in-one systems. Compared with a standard desktop DIMM, a SODIMM is shorter and thinner, allowing it to fit in space-constrained motherboards. The memory chips and electrical interface are the same basic technology as other DIMMs; the difference lies in the package and pin arrangement.

SODIMMs come in several generations corresponding to the memory types used in modern PCs, including DDR, DDR2, DDR3, DDR4, and DDR5. Each generation uses a different connector count and notch position, and the electrical signaling and voltages are not interchangeable between generations. As a result, a DDR4 SODIMM will not fit or operate in a DDR3 or DDR2 slot, and so on. Newer generations typically offer higher bandwidth and lower operating voltages, with DDR4 and DDR5 delivering the most common current performance in recent laptops.

Most consumer laptops use unbuffered, non-ECC SODIMMs. ECC (error-correcting) or registered SODIMMs are more common in business-class laptops and servers, where data integrity and stability are prioritized. When upgrading or replacing memory, it is important to match the generation, type (unbuffered vs ECC), and the maximum supported capacity and speed listed by the device manufacturer.

SODIMMs remain the standard memory upgrade option for portable systems due to their compact form factor and broad compatibility across vendors and generations.