Samsung · Server memory
M386AAK40B40-CWD
128 GB DDR4-2666 ECC Load-Reduced DIMM (LRDIMM), 8-rank ×4.
Specifications JEDEC / manufacturer data
| Memory type | DDR4 | catalog |
| Module type | LRDIMM · ECC Load-Reduced DIMM | catalog |
| Capacity | 128 GB | catalog |
| Speed | DDR4-2666 · PC4-21328 | catalog |
| Organization / rank | 8Rx4 | catalog |
| Voltage | 1.2 V | JEDEC standard for DDR4 |
| Form factor | 288-pin DIMM | standard for DDR4 LRDIMM |
Compatible alternatives same JEDEC specification
Modules match on all key specifications (type, form factor, capacity, speed, rank organization) and are generally interchangeable in servers that accept this spec.
Interchangeability is based on matching JEDEC specifications, not per-server testing. Confirm against your server vendor's qualified parts list.
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Frequently asked
Can I use a Micron module instead?
In most servers, yes: MTA144ASQ16G72LSZ-2S6 (Micron) match this module on every key specification (128 GB, DDR4-2666, LRDIMM, 8Rx4). Keep vendors consistent within a memory bank, and check your server's qualified parts list for edge cases.
What does 8Rx4 mean?
8 ranks of DRAM chips, each 4 bits wide ("×4"). Rank organization affects how many modules a memory controller can drive at full speed, so it's listed as a key spec.