HMCG84AGBRA191N - 32GB DDR5-5600 ECC RDIMM | SK Hynix
MPN: HMCG84AGBRA191N ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $129 | $129.00 |
| 10 | $122.55 | $1,225.50 |
| 100 | $116.1 | $11,610.00 |
| 500 | $109.65 | $54,825.00 |
| 1,000 | $103.2 | $103,200.00 |
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View Datasheet →HMCG84AGBRA191N Maximum Ratings & Electrical Characteristics
| Capacity | 32 GB |
| Memory Type | DDR5 SDRAM RDIMM |
| Data Rate | 5600 MT/s |
| Bandwidth Class | PC5-44800 |
| ECC | ECC Registered |
| Rank | Single Rank (1Rx4) |
| DRAM Organization | x4 |
| Operating Voltage | 1.1 V |
| CAS Latency | CL46 |
| Pin Count | 288-pin DIMM |
| Form Factor | 288-pin RDIMM |
| Configuration | 1 x 32 GB |
| Module Type | Registered DIMM (RDIMM) |
| Application Segment | Server / Datacenter |
| On-die ECC | Yes |
HMCG84AGBRA191N standard Pin Configuration Guide
Complete pinout information for HMCG84AGBRA191N (standard package) with 288-pin DIMM 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 HMCG84AGBRA191N.
Refer to the datasheet for full pin configuration.
Estimated pin count: 288-pin DIMM 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
HMCG84AGBRA191N is suitable for 6 applications: Edge Compute Nodes, Low-VM-Density Virtualization Hosts, General-Purpose Rack Servers, Enterprise Storage Controllers, Data Center Memory Expansion / Upgrades, Network Appliance and Security Gateways.
Edge Compute Nodes
The HMCG84AGBRA191N's 32GB DDR5-5600 density and 1.1V operation make it a strong fit for edge compute servers, where nodes are space- and power-constrained but still need substantial memory bandwidth for local inference and data filtering. Its 44.8 GB/s per-module bandwidth (PC5-44800) accelerates data preprocessing close to the source, while the lower 1.1V rail reduces module power draw roughly 16% versus DDR4 at 1.2V, easing thermal design in compact edge enclosures. Deployed in a 1Rx4 configuration, it also keeps per-channel electrical loading low, supporting populated platforms with limited cooling. Typical builds pair 8-16 of these modules with Xeon Scalable or EPYC processors for 256-512GB per node.
Recommended
Low-VM-Density Virtualization Hosts
For virtualization hosts running a modest number of VMs per node, the HMCG84AGBRA191N provides a balanced 32GB-per-DIMM capacity at DDR5-5600, giving the hypervisor and guest workloads ample bandwidth without over-provisioning density. Registered ECC operation with on-die ECC protects against single-bit memory errors that would otherwise corrupt VM state, a critical requirement for multi-tenant infrastructure. At CL46 and 5600 MT/s, the module reduces memory latency spikes under concurrent VM scheduling versus DDR4-3200 RDIMMs. Populate 2 DIMMs per channel across both EPYC or Xeon sockets to balance bandwidth and cost; avoid mixing with 4800 MT/s modules, which force the channel to downclock and forfeit the bandwidth advantage.
Recommended
General-Purpose Rack Servers
In general-purpose 1U/2U rack servers, HMCG84AGBRA191N fills the mainstream capacity tier: 32GB per DIMM lets a dual-socket server reach 256GB-1TB using standard populations without stepping up to 64GB or 128GB modules. Its single-rank 1Rx4 organization simplifies platform population rules and keeps signal integrity margins high on long server DIMM traces, while ECC registration protects long-running enterprise workloads such as web serving, databases, and file services. The DDR5 dual-32-bit subchannel architecture improves random-access efficiency for mixed workloads compared with DDR4's single 64-bit channel. Standard JEDEC 288-pin RDIMM form factor ensures drop-in compatibility with qualified server platforms.
Recommended
Enterprise Storage Controllers
Enterprise storage controllers and all-flash array heads use RDIMM main memory for write coalescing, metadata caching, and parity computation - workloads that benefit directly from HMCG84AGBRA191N's 5600 MT/s bandwidth and registered ECC reliability. The x4 DRAM organization enables side-band ECC so the controller can correct single-bit errors transparently, protecting data integrity during cached-write windows. Its 1.1V operation reduces module heat inside densely packed storage shelves where airflow is shared with NVMe drives. A typical configuration uses 8 modules (256GB) per controller pair with failover, where identical MPNs across both controllers simplify spare-part inventory and validated configuration management.
Recommended
Data Center Memory Expansion / Upgrades
For data centers refreshing DDR4 fleets, HMCG84AGBRA191N is a standard building block for DDR5 server upgrades, offering a 32GB-per-DIMM step that typically doubles density per DIMM slot versus legacy 16GB DDR4 modules. The 5600 MT/s rate delivers up to 1.75x the per-module bandwidth of DDR4-3200, directly improving memory-bound application throughput. Because it is a JEDEC-standard 288-pin RDIMM, procurement can source across multiple vendors while retaining platform QVL compliance. During mixed-generation transitions, keep this module only on DDR5 platforms - mixing memory generations or module types (RDIMM with UDIMM/LRDIMM) within a server is electrically incompatible and will prevent POST.
Recommended
Network Appliance and Security Gateways
High-throughput network appliances - firewalls, load balancers, and 5G UPF gateways - need large flow tables and packet buffers in main memory, where HMCG84AGBRA191N's 44.8 GB/s per-module bandwidth supports line-rate packet processing at 100G+ speeds. Single-rank 1Rx4 configuration minimizes memory controller latency jitter, which matters for deterministic packet forwarding deadlines, and registered ECC prevents bit errors from corrupting session state during weeks of continuous uptime. The 1.1V rail keeps the memory subsystem within the tight power budgets of front-access network appliance chassis. Pair 4-8 modules with DPDK or VPP-based data planes sized at 128-256GB per appliance.
Recommended
Recommended Products Summary
Engineering reference data for HMCG84AGBRA191N — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | HMCG78AGBUA084N | HMCG78AHBRA289N | HMCG78AEBRA107N | HMCG78AEBRA115N |
|---|---|---|---|---|---|
| Package | 288-pin RDIMM | 288-pin RDIMM - same | 288-pin RDIMM - same | 288-pin RDIMM - same | 288-pin RDIMM - same |
| Brand | SK Hynix | SK Hynix | SK Hynix | SK Hynix | SK Hynix |
| Capacity | 32 GB | 32 GB | 32 GB | 32 GB | 32 GB |
| Data Rate | 5600 MT/s | 4800 MT/s | 4800 MT/s | 4800 MT/s | 4800 MT/s |
| Bandwidth Class | PC5-44800 | PC5-38400 | PC5-38400 | PC5-38400 | PC5-38400 |
| Rank Configuration | Single Rank (1Rx4) | Single Rank (1Rx4) | Dual Rank (2Rx4) | Single Rank (1Rx4) | Single Rank (1Rx4) |
| Operating Voltage | 1.1 V | 1.1 V | 1.1 V | 1.1 V | 1.1 V |
| ECC | ECC Registered | ECC Registered | ECC Registered | ECC Registered | ECC Registered |
| CAS Latency | CL46 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Highest speed grade in the SK Hynix 32GB RDIMM lineup on this page (vs HMCG78AGBUA084N)
- Single-rank 1Rx4 organization for maximum population flexibility (vs HMCG78AHBRA289N)
- Lowest power per GB at 1.1V DDR5 vs legacy DDR4 alternatives (vs HMA84GR7CJR4N-RD)
Design Notes
Never mix HMCG84AGBRA191N (DDR5-5600) with DDR5-4800 HMCG78-series modules in the same channel unless downclocking is acceptable - most platforms run the entire memory subsystem at the slowest module's speed, forfeiting the 17% bandwidth advantage. Also confirm module type compatibility: RDIMMs cannot be mixed with UDIMMs or LRDIMMs on the same platform, and incompatible combinations typically prevent POST. Always follow the server vendor's DIMM population table for mixed-population rules.
HMCG84AGBRA191N operates at the DDR5-standard 1.1V. Estimated thermal impact: a fully populated dual-socket server with 16 modules draws meaningfully less module power than an equivalent DDR4-3200 population at 1.2V, reducing chassis inlet temperature rise. Verify the platform's DDR5 power delivery and DIMM slot thermal ratings at 5600 MT/s operation, since higher data rates increase DRAM IO power somewhat. For dense 1U builds, monitor DIMM inlet temps via BMC sensors during burn-in.
The registered (buffered) address/command interface and single-rank 1Rx4 organization of HMCG84AGBRA191N keep per-channel electrical loading low, which is why it typically sustains 5600 MT/s at one DIMM per channel. At two DIMMs per channel, most platforms derate to 4800 MT/s or lower per the JEDEC speed-bin derating tables. If your workload needs full bandwidth, prefer one DIMM per channel (DPC1) populations; validate stability with a memory stress test (e.g., extended memtest86+ passes) after BIOS updates.
Compliance Information
Compliance data not present in verified web data; SK Hynix server DRAM modules are typically RoHS compliant but this must be confirmed from manufacturer documentation.
