SK hynix · Server memory
HMCG94AHBRA487N
64 GB DDR5-6400 ECC Registered DIMM (RDIMM), dual-rank ×4.
Specifications JEDEC / manufacturer data
| Memory type | DDR5 | catalog |
| Module type | RDIMM · ECC Registered DIMM | catalog |
| Capacity | 64 GB | catalog |
| Speed | DDR5-6400 · PC5-51200 | catalog |
| Organization / rank | 2Rx4 | catalog |
| Voltage | 1.1 V | JEDEC standard for DDR5 |
| Form factor | 288-pin DIMM | standard for DDR5 RDIMM |
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 or SK hynix module instead?
In most servers, yes: MTC40F2046S1RC64BD2 (Micron), HMCG94AHBRA (SK hynix) match this module on every key specification (64 GB, DDR5-6400, RDIMM, 2Rx4). Keep vendors consistent within a memory bank, and check your server's qualified parts list for edge cases.
What does 2Rx4 mean?
Two 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.