# Memory modules

Part ID: 2.03 · Layer 2 (Memory & storage)

The physical DIMM (or module) that packages raw DRAM die, substrate, and management circuitry into the pluggable unit a server actually sockets.

A memory module is the assembly step between raw DRAM (2.02) and a server motherboard: it takes bare die and turns them into a qualified, pluggable part, working alongside the buffer and register chips described next to keep high-rank modules electrically stable. AI-era servers push toward higher-capacity, higher-rank modules to keep memory per socket in step with rising core and accelerator counts, which raises the assembly and qualification bar module makers have to clear with every new platform. For an investor, the module layer is a value-add assembly business distinct from the underlying DRAM trade: margins depend on qualification wins with system builders and on how much of that assembly the large DRAM makers choose to keep in-house versus leave to independent module vendors. As capacity per module rises, the module becomes a more complex, higher-content part rather than a simple pass-through of the chips inside it.

**AI delta:** Higher memory-per-socket requirements in AI servers push module makers toward higher-capacity, higher-rank designs that carry more assembly and qualification content per unit.

## Companies

| Company | Role | Confidence | Ownership | Ticker | Note |
|---|---|---|---|---|---|
| ADATA | manufacturer | inferred | public | 3260.TWO |  |
| Micron | in_house | inferred | public | MU |  |
| Netlist | manufacturer | inferred | public | NLST |  |
| Penguin Solutions/SMART | manufacturer | inferred | public | PENG |  |
| Samsung Electronics | manufacturer | inferred | public | 005930.KS |  |
| SK Hynix | manufacturer | inferred | public | 000660.KS |  |
| Kingston | manufacturer | inferred | private |  |  |

Confidence tags: disclosed = company/filing statement; reported = trade press or partner list; inferred = taxonomy lead.