SK hynix HMCG94AGBRA177N – 64GB DDR5-5600 ECC Registered Server Memory

Description

The SK hynix HMCG94AGBRA177N is a high-capacity enterprise memory module engineered for modern DDR5 server platforms requiring a combination of high memory bandwidth, ECC reliability, and registered-memory architecture.

With a capacity of 64GB and a rated speed of 5600MT/s, the module provides a theoretical maximum transfer bandwidth of approximately 44.8GB/s per module, making it suitable for virtualization, database processing, cloud infrastructure, analytics, and other memory-intensive workloads.

The module uses a 2Rx4 dual-rank x4 organization. Its Registered DIMM architecture places register/buffer circuitry between the memory controller and DRAM devices, helping maintain signal integrity in systems populated with multiple DIMMs. ECC support provides error detection and correction capabilities appropriate for enterprise computing environments.

The module operates at the standard 1.1V DDR5 voltage and uses the 288-pin DIMM form factor. Published specifications identify the module as PC5-44800 / DDR5-5600, CL46, ECC Registered, while MSI’s server AVL independently confirms the exact MPN and its 64GB / 2Rx4 / 5600MT/s configuration.

3. Complete Technical Specification

Specification	Details
Manufacturer	SK hynix
Part Number / MPN	HMCG94AGBRA177N
Memory Type	DDR5 SDRAM
Capacity	64GB
Module Configuration	1 × 64GB
Module Type	ECC Registered DIMM (RDIMM)
Form Factor	288-pin DIMM
Memory Speed	DDR5-5600
Data Rate	5600MT/s
Module Bandwidth	PC5-44800
Theoretical Bandwidth	Up to 44.8GB/s
ECC	Yes
Registered / Buffered	Registered
Rank Configuration	2Rx4 – Dual Rank
Organization	x4
CAS Latency	CL46
Voltage	1.1V
Memory Architecture	DDR5 ECC Registered
Pin Count	288-pin
Application	Enterprise Servers / Workstations
Memory Class	Server / Data Center
Cooling	Standard DIMM design; system airflow required
Compatibility Type	DDR5 ECC RDIMM platforms

The exact MPN is identified by MSI as SK hynix / DDR5 / ECC / Registered DIMM / 64GB / 2Rx4 / 5600MT/s / HMCG94AGBRA177N. Independent references also specify PC5-44800, CL46, 1.1V, 288-pin RDIMM.

4. Applications

The HMCG94AGBRA177N is suitable for:

Enterprise server memory upgrades
Data-center servers
Virtualization hosts
Cloud-computing infrastructure
Database servers
Web and application servers
Storage and file servers
High-performance computing
Engineering and scientific workloads
Data analytics and large-scale processing
Professional workstations supporting DDR5 ECC RDIMM
Memory-intensive enterprise applications
Server consolidation projects

5. Compatibility

The HMCG94AGBRA177N requires a system specifically designed to support DDR5 ECC Registered DIMMs (RDIMM).

The exact part number is qualified by MSI for server platforms as a 64GB, 2Rx4, DDR5-5600 ECC Registered DIMM, with a listed population capacity of up to 32 DIMMs on the relevant platform.

It has also been documented in systems using Intel Xeon server-class processors, including a configuration listing the HMCG94AGBRA177N as 64GiB registered 5600MHz memory.

Compatibility Requirements

The host platform should support:

DDR5 ECC RDIMM
5600MT/s DDR5 memory
64GB DIMMs
2Rx4 memory organization, where required
288-pin server DIMMs

Important: DDR5 RDIMM is not interchangeable with DDR5 UDIMM or SO-DIMM. The server motherboard and CPU memory controller must explicitly support registered ECC memory.

When installing multiple modules, follow the server manufacturer’s DIMM population rules. Depending on the platform, installing additional DIMMs may automatically reduce the operating memory speed.