128GB DDR5 4800mhz Pc5-38400 Hynix HMCT04AEERA138N SDRAM 288-pin Rdimm 1.1v Quad Rank X4 RAM Module

Detailed Product Overview

The Hynix HMCT04AEERA138N 128GB DDR5 4800MHz PC5-38400 ECC SDRAM Registered CL46 288-pin RDIMM memory module delivers next-generation server performance. Designed for enterprises, cloud platforms, and demanding data centers, this quad-rank x4 module provides robust reliability, rapid data transfer speeds, and exceptional stability. With its combination of large storage capacity and ECC error correction, it ensures mission-critical workloads operate efficiently and securely.

General Specifications

• Manufacturer: SK Hynix
• Part Number: HMCT04AEERA138N
• Product Name: 128GB DDR5 SDRAM Registered RDIMM

Performance-Oriented Technical Features

This advanced server memory solution is engineered with DDR5 technology, which offers superior throughput compared to previous generations. By utilizing high-frequency architecture and improved bandwidth efficiency, it supports faster operations and smoother multitasking across large-scale enterprise systems.

• Capacity: 128GB
• Technology: DDR5 SDRAM
• Module Quantity: 1 x 128GB
• Operating Speed: 4800MHz (DDR5-48000 / PC5-38400)
• Error Checking: ECC (Error-Correcting Code)
• Signal Processing: Registered
• CAS Latency: CL46
• Rank Type: Quad Rank x4 (4Rx4)

Key Highlights of DDR5 Performance

The DDR5 standard introduces remarkable improvements in memory performance. Compared to DDR4 modules, this architecture offers:

• Higher data transfer rates for reduced processing bottlenecks
• Improved power efficiency with lower voltage consumption
• Better scalability for future workloads and system expansions
• Enhanced error correction ensuring data integrity for critical systems

Physical Build and Compatibility

Built with a durable form factor and industry-standard configuration, the Hynix 128GB DDR5 module fits seamlessly into modern server architectures. Its robust physical design ensures longevity and smooth integration in enterprise environments.

• Form Factor: 288-Pin Registered DIMM (RDIMM)
• Height: 1.00 in.
• Depth: 6.75 in.

Enterprise-Grade Reliability

ECC support and registered signaling are specifically optimized for enterprise systems, making this module suitable for:

• Mission-critical server operations
• Cloud infrastructure requiring consistent uptime
• Virtualization workloads demanding high stability
• Large-scale data analytics and AI processing

Advanced Error Correction and Stability

With ECC (Error-Correcting Code) technology and registered signaling, the module reduces system crashes, minimizes risks of corrupted data, and provides secure operations in high-intensity applications. This is particularly beneficial in financial services, research computing, and database-driven operations.

Why Choose SK Hynix DDR5 Modules?

• Industry-leading innovation in DDR5 memory development
• Trusted by global enterprises for long-term stability
• Optimized for scalability and performance under demanding conditions
• Lower latency and higher transfer speeds compared to DDR4

Use Case Scenarios

Organizations can deploy the Hynix HMCT04AEERA138N memory module across a wide spectrum of environments, including:

• Cloud computing clusters with high-density memory requirements
• Database servers handling heavy transactional loads
• Artificial Intelligence (AI) and machine learning infrastructures
• Scientific research and simulation systems

Performance Benefits in Real Applications

By integrating this 128GB DDR5 memory module, enterprises benefit from improved:

• Data throughput for time-sensitive applications
• Energy efficiency with reduced power draw per bit processed
• System responsiveness during peak loads
• Server consolidation with higher capacity per module

Compatibility Considerations

Before deployment, ensure that your server hardware supports DDR5 registered DIMMs with ECC functionality. As systems transition from DDR4 to DDR5 standards, compatibility checks are essential for achieving maximum performance benefits.

Hynix HMCT04AEERA138N 128GB DDR5 4800MHz PC5-38400 ECC Registered RDIMM — Product Overview

The Hynix HMCT04AEERA138N 128GB DDR5 4800MHz PC5-38400 ECC Registered RDIMM memory module is designed for data centers, enterprise-class servers, and high-performance computing platforms that require large memory capacity, reliable error correction, and proven signal integrity. This category covers quad-rank, x4-bit-organization RDIMMs built to support modern server architectures that utilize DDR5 memory technology, offering improved bandwidth, power efficiency, and enhanced reliability over earlier generations.

Key Specifications and What They Mean

Form Factor and Pinout

This module uses the industry-standard 288-pin RDIMM form factor. That means it is compatible with motherboards and server systems designed for RDIMM DDR5 modules with a 288-pin connector. The registered (buffered) design places a register between the DRAM chips and the memory controller to stabilize large memory arrays in multi-module configurations.

Density and Rank Configuration

At 128GB per module, the HMCT04AEERA138N represents high-density memory suited for memory-intensive workloads such as virtualization, in-memory databases, analytics, and scientific computing. It is a Quad Rank module — effectively composed of four rank groups — enabling the host to address more memory banks and deliver high aggregated capacity per channel.

Memory Type and Speed

As a DDR5 device operating at 4800MHz (marketed as PC5-38400), this module doubles down on DDR5’s advantages: higher peak transfer rates, improved prefetch architecture, and on-die features that streamline power delivery and signaling. The PC5-38400 designation refers to the theoretical peak bandwidth per module under standard configuration.

ECC and Registered Features

ECC (Error-Correcting Code) capability is essential in server and mission-critical environments — it detects and corrects single-bit errors and flags multi-bit errors to prevent data corruption. The registered nature (RDIMM) improves signal integrity and allows for larger memory populations on a system board without overloading the memory controller.

Voltage and Timing

This module is specified at a nominal voltage of 1.1V, aligning with DDR5’s lower operating voltage compared to DDR4 and contributing to better energy efficiency at scale. The CAS latency and timing spec (CL46 in this part number) reflect DDR5 timing characteristics tuned for stability when running multiple ranks at high capacity.

Architecture Deep Dive: Quad Rank x4 Organization

What Quad Rank Provides

Quad-rank modules present advantages and trade-offs. By grouping memory chips into four separate ranks, manufacturers can achieve higher capacity (128GB and beyond) while permitting interleaving and improved parallel access across ranks. This is particularly beneficial for multi-threaded server applications and memory-bound workloads.

x4 Bit-Organization Explained

An x4 organization indicates each DRAM device contributes 4 data bits to the module’s 64-bit data bus (plus ECC bits). The x4 configuration enables the use of a larger number of smaller-die devices, which eases manufacturing and often allows higher densities per module. For system designers, x4 devices are typical in high-capacity, high-reliability server DIMMs.

Performance Characteristics and Benchmarks (What to Expect)

Bandwidth and Latency Considerations

With DDR5-4800 / PC5-38400, the theoretical peak bandwidth per pin is significantly higher than previous generations. In multi-socket or multi-channel server setups, pairing several HMCT04AEERA138N modules can unlock very high memory throughput for data-intensive tasks. The trade-off is that very large, quad-rank modules sometimes exhibit slightly higher effective latencies compared to single- or dual-rank DIMMs, due to rank switching and electrical loading — but ECC and registered buffering mitigate many real-world stability concerns.

Ideal Workloads

• Virtualization platforms running dozens of VMs where memory capacity per socket is the limiting factor.
• In-memory databases (e.g., SAP HANA, Redis Enterprise) that store large datasets directly in RAM.
• HPC and scientific simulations requiring large addressable datasets.
• Big data analytics stacks and machine learning inference nodes that benefit from large RAM footprints.

 BIOS/UEFI and Firmware Tuning

Large-capacity RDIMMs may require BIOS/UEFI memory training sequences and firmware updates to reliably initialize multi-rank DIMMs at rated JEDEC speeds. System administrators should install the latest firmware from their server vendor and, if necessary, configure memory voltage and timing settings per vendor guidance to ensure stability under full load.

Thermal and Power Considerations

Voltage Efficiency

Operating at 1.1V helps reduce per-module power draw versus older DDR4 modules, which is significant at rack scale. For data centers with dense memory configurations, this yields measurable power savings and reduced cooling requirements.

Heat Spreaders and Airflow

Although RDIMMs typically do not ship with aggressive heat spreaders like some consumer DIMMs, proper chassis airflow and server rack cooling are critical when deploying multiple 128GB modules. Adequate airflow ensures sustained performance and prolongs component lifetime.

Reliability, Testing, and Quality Assurance

ECC and Error Handling

The integrated ECC corrects single-bit errors and detects multi-bit errors, improving uptime and data integrity for mission-critical systems. For enterprises running 24/7 operations, ECC is not optional — it’s a foundational feature to minimize silent data corruption.

Validation and Burn-In Procedures

Enterprise-grade modules such as the HMCT04AEERA138N typically undergo extensive testing: JEDEC compliance checks, thermal cycling, voltage stress testing, and burn-in tests to identify early failures and guarantee longevity. Vendors may offer lifetime or multi-year warranties, and many modules include vendor-provided validation with major server OEMs.

Use Cases and Deployment Scenarios

Cloud and Virtualized Data Centers

Cloud providers and private clouds that need to maximize VM density benefit from high-capacity RDIMMs. Swapping out lower-capacity DIMMs for 128GB DDR5 RDIMMs increases the total addressable memory per server socket, enabling more concurrent workloads per host.

Enterprise Databases and Analytics

Databases that maintain large working sets in RAM can dramatically reduce I/O overhead when sufficient memory is available. Deploying multiple HMCT04AEERA138N modules allows database engineers to configure in-memory buffer pools at scales that improve transaction throughput and lower query latency.

High-Performance Computing (HPC)

HPC clusters often require nodes with maximum memory per socket for simulations and data-intensive tasks. Quad-rank, high-density DDR5 modules maximize per-node capacity without resorting to multi-socket complexity, simplifying cluster configuration and job scheduling.

Comparison: Hynix HMCT04AEERA138N vs. Other Server DIMM Options

Registered DDR5 RDIMM vs. LRDIMM

Registered DIMMs (RDIMM) use an integrated register to buffer command and address signals, while Load-Reduced DIMMs (LRDIMM) place isolation devices between the DRAM chips and the memory controller to reduce electrical loading. LRDIMMs can sometimes support even greater capacity per system by further reducing load, but RDIMMs like the HMCT04AEERA138N offer a favorable balance of performance, cost, and compatibility for many server platforms.

Quad Rank vs. Dual/Single Rank Trade-offs

Quad-rank modules yield higher capacity but may influence per-channel achievable speed in highly populated configurations. Dual- and single-rank DIMMs can offer lower latency and sometimes higher per-module frequencies in mixed configurations, but they cap out at lower per-module capacities. Choose quad-rank modules when capacity is prioritized over absolute lowest latency.

Purchase Considerations and Cost Efficiency

Cost per GB Analysis

High-density 128GB DDR5 RDIMMs typically offer cost savings on a per-GB basis compared to populating a system with several smaller modules to reach the same capacity. For organizations optimizing total cost of ownership (TCO), investing in fewer, higher-capacity modules reduces slot consumption and can lower motherboard/RAS complexity.

Warranty, Support, and Vendor Services

When acquiring server memory, evaluate warranty length, RMA procedures, and technical support channels provided by the vendor or distributor. Vendor-backed compatibility validation with major server manufacturers (e.g., Dell, HPE, Lenovo) adds confidence for enterprise deployments and simplifies procurement approvals.

Static Safety and Handling

Observe ESD precautions when handling RDIMMs: use grounded wrist straps, handle modules by the edges, and avoid touching gold fingers or component surfaces. Ensure modules are seated firmly until latches click, and perform post-installation memory tests to verify system stability.

Security and Data Integrity Considerations

ECC as a First Line of Defense

ECC protects against single-bit errors and prevents silent data corruption—essential for storage nodes, financial systems, and any application where data correctness is paramount. Retaining ECC-capable memory across the fleet is a best practice for data-centric organizations.

Memory Encryption and Secure Boot

Many server platforms support memory encryption features and secure boot processes to defend against physical memory tampering and cold-boot attacks. When deploying HMCT04AEERA138N modules, ensure these platform-level security features are configured to align with organizational security policies.

Environmental and Compliance Notes

Regulatory and RoHS Considerations

Enterprise DRAM modules typically comply with regional regulations and restrictions on hazardous substances (RoHS). Verify product datasheets for environmental compliance declarations if regulatory or sustainability reporting is required by procurement processes.

Data Center Environmental Planning

Deploying many high-capacity DDR5 modules impacts rack-level power and cooling planning. Incorporate accurate power-per-module figures into capacity planning to ensure cooling infrastructure scales appropriately with memory-dense server configurations.

Content for Procurement: Specification Checklist

• Part Number: HMCT04AEERA138N
• Capacity: 128GB
• Type: DDR5 RDIMM (Registered)
• Speed: 4800MHz (PC5-38400)
• Organization: Quad Rank, x4
• Pins: 288-pin
• Voltage: 1.1V
• CAS Latency: CL46 (as indicated by part coding)
• Error Correction: ECC
• Intended Use: Enterprise servers, data centers, HPC nodes
• Vendor Validation: Check server OEM QVL for compatibility

Why Choose High-Density DDR5 Registered Modules?

High-density modules like the Hynix HMCT04AEERA138N are ideal when the primary design goal is to maximize memory footprint per socket while maintaining ECC protection, operational resilience, and reasonable cost per GB. They enable simplified server inventory (fewer DIMMs to manage per server), reduce slot contention, and allow IT teams to scale workloads that prioritize memory capacity above all else.

Suggested Deployment Patterns

Scale-Up Servers

For single-socket or dual-socket servers serving virtualization or database workloads, populate symmetric module counts per channel to preserve interleaving. Use 128GB modules in matched pairs or quads to reach target memory sizes while keeping channel balance intact.

Cluster Nodes

When configuring HPC or analytics clusters, standardize on one high-density DIMM across all nodes to simplify maintenance, spare parts inventory, and performance predictability.

Closing Technical Notes (No Conclusion)

When specifying and deploying the Hynix HMCT04AEERA138N 128GB DDR5 4800MHz PC5-38400 ECC Registered RDIMM, consider the system-level implications of quad-rank, x4 organization, firmware readiness, and cooling infrastructure. These modules provide a robust solution for workloads that require maximum memory capacity per socket, while ECC and registered buffering deliver the reliability and signal integrity expected in enterprise environments. Always validate compatibility with your server manufacturer and follow best practices for installation, monitoring, and lifecycle management to achieve the best performance and uptime from your memory investment.