SO-DIMM
Small Outline DIMM — compact RAM form factor for laptops, NUC mini-PCs, some servers. ~50% smaller area than desktop DIMM. 260-pin (DDR4/DDR5). Desktop: 288-pin DIMM.
Price/GB: ~10-20% more expensive than desktop DIMM due to lower volume. Speed limits: laptop mobo has thermal + electrical constraints → typically lower clock than desktop (DDR4-3200 vs 4400). Apple M-Macs abandoned SO-DIMM entirely → LPDDR PoP. Framework + Lenovo stick with SO-DIMM for upgrade friendliness. CAMM2 (Compression Attached Memory Module) is a new form factor from 2024 — slimmer than SO-DIMM, more bandwidth, replacement candidate.