HMCG78AHBRA471N - 16GB DDR5-6400 RDIMM ECC | SK Hynix
MPN: HMCG78AHBRA471N ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $649 | $649.00 |
| 10 | $719 | $7,190.00 |
| 100 | $829 | $82,900.00 |
| 500 | $959 | $479,500.00 |
| 1,000 | $1099 | $1,099,000.00 |
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View Datasheet →HMCG78AHBRA471N Maximum Ratings & Electrical Characteristics
| Manufacturer | SK Hynix |
| MPN | HMCG78AHBRA471N |
| Memory Type | DDR5 SDRAM |
| Module Type | 288-Pin ECC Registered DIMM (RDIMM) |
| Total Capacity | 16 GB |
| Data Rate | 6400 MT/s |
| PC Bandwidth Designation | PC5-51200 |
| Rank x Organization | 1Rx8 (Single Rank, x8) |
| CAS Latency | CL52 |
| Operating Voltage | 1.1 V |
| Error Correction | ECC |
| Pins | 288 |
| Country of Origin | Malaysia |
| Application | Server / Enterprise |
| Condition (ServerSupply listing) | Brand New, In Stock |
| Features | ECC Memory, Registered |
HMCG78AHBRA471N standard Pin Configuration Guide
Complete pinout information for HMCG78AHBRA471N (standard package) with 288 pins. This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for HMCG78AHBRA471N.
Refer to the datasheet for full pin configuration.
Estimated pin count: 288 pins (digital package)
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
HMCG78AHBRA471N is suitable for 6 applications: Entry-Level Virtualization Servers, Edge Compute Nodes, Small-Scale Business Servers, Storage Controllers and NAS, Workstation Memory Upgrades, Network Appliances and Firewalls.
Entry-Level Virtualization Servers
The HMCG78AHBRA471N fits entry-level virtualization hosts that balance per-VM memory allocation against channel bandwidth. Its 6400 MT/s (PC5-51200, 51.2 GB/s peak) data rate gives hypervisors such as VMware ESXi and Proxmox sufficient memory bandwidth for consolidated workloads, while ECC protection corrects single-bit errors that could otherwise corrupt guest memory. The registered (buffered) interface reduces electrical load on the memory controller, allowing all DIMM channels to be populated for maximum interleaving. Corewave Labs specifically positions this module for entry-level virtualization, edge compute, and small-scale servers. Populate DIMMs in matched sets per the server vendor's population rules to enable multi-channel interleaving at full speed.
Recommended
Edge Compute Nodes
Edge compute appliances benefit from the HMCG78AHBRA471N's combination of DDR5 efficiency and data integrity. Operating at 1.1V (versus DDR4's 1.2V), the module reduces memory subsystem power, which matters in passively cooled or thermally constrained edge enclosures. On-module ECC prevents silent data corruption in unattended remote sites where physical service visits are costly. The 16GB single-rank configuration provides a predictable memory footprint for container runtimes, local caching tiers, and inferencing workloads at the network edge. Distributors such as Corewave Labs explicitly target this module at edge compute deployments. Pair it with a server-class CPU platform whose BIOS supports the 6400 MT/s bin, or accept automatic down-clocking to the platform maximum.
Recommended
Small-Scale Business Servers
For small and medium business servers running databases, file services, and email workloads, the HMCG78AHBRA471N delivers enterprise-grade reliability at a 16GB per-module price point. ECC registered DDR5 protects business-critical data against bit-level errors, and the 6400 MT/s bin (PC5-51200) keeps database buffer pools and virtual memory subsystems responsive. The 288-pin RDIMM conforms to the JEDEC DDR5 server standard, ensuring compatibility with mainstream tower and rack platforms from major OEMs. ServerSupply lists the module as brand new and in stock as of 2026-09-05, simplifying procurement for system integrators building small-server BOMs. Verify the platform QVL lists 1Rx8 modules at this speed bin before volume deployment.
Recommended
Storage Controllers and NAS
Storage systems and NAS head units use ECC registered memory to guarantee data integrity between host and disk arrays. The HMCG78AHBRA471N's ECC corrects single-bit errors before they propagate into written data or filesystem metadata, and its registered buffering maintains signal integrity on heavily loaded memory buses typical of storage controllers. The 51.2 GB/s peak bandwidth (PC5-51200) supports RAID parity calculation, deduplication tables, and caching layers. The single-rank 1Rx8 organization presents lower controller load, useful when the storage platform populates many DIMM slots. Use matched modules across channels to maximize interleaved bandwidth for streaming and backup workloads, and confirm the storage OS vendor certifies DDR5-6400 RDIMMs.
Recommended
Workstation Memory Upgrades
Professional workstations built on server-derived chipsets (Intel Xeon W, AMD Threadripper PRO) accept RDIMMs and benefit from the HMCG78AHBRA471N's enterprise reliability. Content creation, CAD, simulation, and local AI development workloads consume large memory footprints, and ECC protects long-running render or training jobs from silent bit errors that would force costly restarts. The 6400 MT/s rate supplies 51.2 GB/s peak bandwidth per module for memory-bound tasks such as finite-element analysis and video editing timelines. The 1.1V DDR5 operating voltage lowers sustained thermal output in quiet workstation chassis. Check the workstation vendor's QVL, since some consumer-tier boards accept only UDIMMs and cannot host RDIMMs at all.
Recommended
Network Appliances and Firewalls
High-throughput network appliances - firewalls, SD-WAN gateways, and load balancers - rely on fast, reliable memory for session tables, deep packet inspection buffers, and TLS session caches. The HMCG78AHBRA471N's 6400 MT/s interface supplies 51.2 GB/s peak bandwidth for line-rate packet processing, while ECC prevents the subtle bit errors that could corrupt security-critical session state. The registered DDR5 interface supports full channel population in short-depth appliances, and the 16GB 1Rx8 configuration suits appliances with moderate DRAM budgets. Its 1.1V operation helps meet the power envelopes of fanless and short-depth network hardware. Validate BIOS support for DDR5-6400 RDIMMs on the appliance platform before deployment.
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Engineering reference data for HMCG78AHBRA471N — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | HMCG78AHBRA289N | HMCG78AEBRA107N | HMCG78AGBUA084N | HMCG78MEBRA113N |
|---|---|---|---|---|---|
| Package | 288-Pin DDR5 RDIMM | 288-Pin DDR5 RDIMM - same | 288-Pin DDR5 RDIMM - same | 288-Pin DDR5 RDIMM - same | 288-Pin DDR5 RDIMM - same |
| Brand | SK Hynix | SK Hynix | SK Hynix | SK Hynix | SK Hynix |
| Capacity | 16 GB | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Data Rate | 6400 MT/s (PC5-51200) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Module Type | ECC Registered DIMM | ECC RDIMM | ECC RDIMM | ECC RDIMM | ECC RDIMM |
| Rank x Organization | 1Rx8 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| Operating Voltage | 1.1 V | 1.1 V | 1.1 V | 1.1 V | 1.1 V |
| CAS Latency | CL52 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
| ECC | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Top-tier DDR5 speed bin (vs HMCG78AHBRA289N)
- Single-rank 1Rx8 organization (vs HMCG78AGBUA084N)
- ECC registered reliability for server data integrity (vs HMCG78MEBSA092N)
Design Notes
Never mix RDIMMs with UDIMMs or SODIMMs on the same platform: DDR5 registered modules cannot coexist with unbuffered modules on any channel, and all modules in a server should share the same rank count and speed bin to ensure reliable memory training. The HMCG78AHBRA471N is 1Rx8 - when populating a channel with multiple DIMMs, prefer identical MPNs to guarantee uniform timing. Note this module is a DDR5 288-pin part and is mechanically keyed to prevent insertion into DDR4 slots; forcing it will damage both module and slot.
Verify platform support for the 6400 MT/s bin before procurement. Many server platforms qualified at launch only certify RDIMMs up to 5600 MT/s; a 6400 MT/s module such as the HMCG78AHBRA471N will train to a lower JEDEC bin in that case, leaving bandwidth unused. Consult the CPU vendor's memory QVL and the server BIOS release notes. For AMD EPYC and Intel Xeon Scalable systems, full 6400 MT/s support typically requires one DIMM per channel (1DPC) population; 2DPC configurations often down-clock.
Server memory subsystems rely on chassis airflow across DIMM channels. DDR5 moves the PMIC onto the module, adding a local heat source compared to DDR4, so maintain the server vendor's specified airflow paths and install DIMM heatsinks or fillers as specified in the chassis manual. Estimated: at 1.1V a fully populated 16-channel server draws tens of watts in the memory domain alone; blocked airflow can push DRAM above the JEDEC refresh-temperature threshold, triggering 2x refresh rate and increased latency.
Compliance Information
Compliance data not provided in verified web sources. SK Hynix enterprise modules are typically RoHS compliant, but confirm via official SK Hynix product documentation.
