Micron · Server memory
MTA18ASF2G72AZ-2G6D1ZI
16 GB DDR4-2666 ECC Unbuffered DIMM (UDIMM), dual-rank ×8. Sold by Crucial under its own part numbers, all cross-referenced below.
Specifications JEDEC / manufacturer data
| Memory type | DDR4 | catalog |
| Module type | UDIMM · ECC Unbuffered DIMM | catalog |
| Capacity | 16 GB | catalog |
| Speed | DDR4-2666 · PC4-21328 | catalog |
| Organization / rank | 2Rx8 | catalog |
| Voltage | 1.2 V | JEDEC standard for DDR4 |
| Form factor | 288-pin DIMM | standard for DDR4 UDIMM |
OEM part numbers same module, OEM-branded
| Vendor | OEM part number | Verification |
|---|
| Crucial | CT16G4WFD8266.18FD1 | catalog |
OEM cross-references are compiled from distributor cross-reference data and OEM documentation. Verify against your vendor's parts list before ordering.
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
Is Crucial CT16G4WFD8266.18FD1 the same module as MTA18ASF2G72AZ-2G6D1ZI?
Yes. Crucial resells this Micron module under part number CT16G4WFD8266.18FD1. The physical module is identical: OEM part numbers are branding, not different hardware.
Can I use a Micron or Samsung module instead?
In most servers, yes: MTA18ASF2G72AZ-2G6 (Micron), MTA18ASF2G72AZ-2G6D1 (Micron), M391A2K43BB1-CTD (Samsung) match this module on every key specification (16 GB, DDR4-2666, UDIMM, 2Rx8). Keep vendors consistent within a memory bank, and check your server's qualified parts list for edge cases.
What does 2Rx8 mean?
Two ranks of DRAM chips, each 8 bits wide ("×8"). Rank organization affects how many modules a memory controller can drive at full speed, so it's listed as a key spec.