The SK hynix HMCG94AHBRA486N is a 64GB DDR5-6400 ECC Registered DIMM (RDIMM) designed for modern enterprise servers, data centers, virtualization platforms, and high-performance computing environments. This high-density server memory module combines 64GB capacity, 6400 MT/s speed, ECC reliability, registered-memory architecture, and 2Rx4 dual-rank organization to provide high bandwidth, stability, and scalability for demanding server workloads. Current server qualification documentation identifies this exact part as 64GB DDR5-6400 RDIMM, 2Rx4, ECC.
DDR5-6400 High-Speed Performance
The HMCG94AHBRA486N operates at 6400 MT/s, providing a theoretical bandwidth of approximately 51.2 GB/s per module. This high memory throughput makes it suitable for modern server processors and workloads that require rapid processing of large amounts of data.
The module is classified as DDR5-6400 and uses a 288-pin RDIMM design. Product listings for the exact MPN identify it as a DDR5-6400 8Gx80 RDIMM 2Rx4 (64GB) module.
Actual operating speed can vary depending on the processor, BIOS configuration, DIMM population, and server platform.
64GB High-Density Server Memory
With 64GB of memory capacity per module, the HMCG94AHBRA486N provides a strong balance between density and performance. Multiple modules can be installed in compatible servers to achieve substantial system memory capacity.
It is well suited for:
- Enterprise servers
- Data-center infrastructure
- Server virtualization
- Cloud computing
- Database servers
- AI and machine-learning workloads
- Data analytics
- High-performance computing
- Virtual desktop infrastructure
- Enterprise applications
- Large-scale application hosting
ECC Registered DIMM Architecture
The HMCG94AHBRA486N is an ECC Registered DIMM (RDIMM). ECC memory is designed to detect and correct certain types of memory errors, helping improve data integrity and system stability in professional server environments.
The registered architecture is intended for compatible server platforms and should not be confused with standard desktop UDIMM or laptop SO-DIMM memory.
MSI server qualification documentation specifically lists the HMCG94AHBRA486N as SK hynix DDR5 RDIMM, 64GB, 2R×4, 6400 MT/s, ECC.
2Rx4 Dual-Rank Organization
The exact HMCG94AHBRA486N uses a 2Rx4 dual-rank organization. Technical listings identify it as DDR5-6400 8Gx80 RDIMM 2Rx4 (64GB).
The dual-rank x4 configuration is an important specification when verifying compatibility and planning the DIMM population of a server.
High-Bandwidth DDR5 Technology
DDR5 provides significantly higher memory bandwidth than previous-generation DDR4 memory. At 6400 MT/s, this module is designed for newer server platforms that can take advantage of high-speed DDR5 memory.
The approximately 51.2 GB/s theoretical bandwidth per module can help support workloads involving large datasets, virtualization, databases, analytics, and other memory-intensive applications.
Enterprise and Data-Center Applications
Virtualization:
The 64GB capacity provides substantial memory resources for running multiple virtual machines and applications.
Database Servers:
High memory capacity and ECC functionality make this module suitable for demanding database environments.
Cloud Infrastructure:
Designed for compatible data-center platforms requiring high-density DDR5 RDIMM memory.
AI & Data Analytics:
High memory bandwidth and 64GB capacity can support workloads that process large datasets.
High-Performance Computing:
Suitable for compatible HPC systems requiring high-capacity, reliable server memory.
Proven Enterprise Server Compatibility
The exact HMCG94AHBRA486N has been documented in multiple enterprise server platforms. Lenovo ThinkSystem systems have been recorded using this exact 64GB, 2-rank, 6400 MT/s SK hynix module.
HPE documentation also lists HMCG94AHBRA486N as a 64GB RDIMM, 16Gb, 2Rx4, PC5-6400B-R module.
This makes it a well-established option for modern enterprise server environments.
Compatibility
Before installing the HMCG94AHBRA486N, verify that the target server supports:
- DDR5 ECC RDIMM
- 64GB DIMMs
- DDR5-6400
- 2Rx4 dual-rank organization
- 288-pin DDR5 RDIMMs
- Compatible processor and memory controller
- Required DIMM population configuration
- Server maximum supported memory capacity
- Appropriate BIOS/firmware support
The DIMM may operate at a lower speed when required by the processor or server configuration.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | SK hynix |
| Part Number | HMCG94AHBRA486N |
| Capacity | 64GB |
| Memory Technology | DDR5 SDRAM |
| Memory Type | ECC Registered DIMM |
| Module Type | RDIMM |
| Speed | 6400 MT/s |
| Memory Standard | DDR5-6400 |
| Theoretical Bandwidth | 51.2 GB/s |
| Rank | 2Rx4 / Dual Rank |
| Bus Organization | 8Gx80 |
| ECC | Yes |
| Registered | Yes |
| Pin Count | 288-pin |
| Form Factor | RDIMM |
| Application | Enterprise Server / Data Center |
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