HMCG78AHBRA476N Hynix 16GB PC5-51200 DDR5-6400MHz 1Rx8 ECC Memory

Hynix HMCG78AHBRA476N 16GB Memory Module

The Hynix HMCG78AHBRA476N features a substantial 16GB memory capacity configured as a single 1x16GB module. This configuration provides optimal flexibility for server deployments, allowing administrators to populate DIMM slots according to specific workload requirements. The single-module design enables efficient memory scaling while maintaining system stability and performance consistency across various server platforms.

Memory Technology and Speed

Utilizing cutting-edge DDR5 SDRAM technology, this memory module operates at an impressive 6400 MT/s (MegaTransfers per second). This represents a significant performance leap over previous DDR4 generations, delivering enhanced data throughput and improved overall system responsiveness. The PC5-51200 designation confirms compliance with industry-standard performance classifications for DDR5 memory modules operating at this speed grade.

Advanced Memory Architecture

DDR5 Technological Advancements

The HMCG78AHBRA476N incorporates several DDR5-specific architectural improvements that distinguish it from previous memory generations. These include an enhanced command structure, improved bank grouping, and refined burst operations that collectively contribute to superior performance in server environments. The module's design specifically addresses the demanding requirements of modern data centers and enterprise computing applications.

1RX8 Organization and Rank Structure

This module features a 1RX8 organization, indicating a single-rank configuration with eight internal banks. This specific organization optimizes memory access patterns and reduces signal loading on the memory bus, resulting in improved signal integrity and timing margins. The single-rank design ensures compatibility with a wide range of server architectures while providing excellent performance characteristics for most enterprise workloads.

Server-Grade Features and Reliability

ECC and Registered DIMM Technology

The integrated ECC functionality represents a critical reliability feature for server environments. This advanced error correction capability automatically detects and corrects single-bit memory errors while detecting multi-bit errors. This robust error management system significantly enhances data integrity and system stability, making the module ideal for mission-critical applications where data accuracy is paramount. The ECC implementation operates transparently to the operating system and applications, providing continuous protection without performance degradation.

Registered DIMM (RDIMM) Architecture

As a Registered DIMM, this memory module incorporates register chips that buffer command, address, and control signals between the memory controller and DRAM chips. This buffering reduces electrical load on the memory controller, enabling support for higher memory capacities and improved signal integrity in multi-DIMM configurations. The RDIMM design is particularly beneficial in servers requiring large memory configurations, as it enhances system stability and reliability while maintaining performance consistency.

Power Efficiency

Operating at a nominal voltage of 1.1V, the HMCG78AHBRA476N demonstrates significant power efficiency improvements compared to previous memory generations. This reduced operating voltage contributes to lower overall power consumption in server environments, helping to reduce operational costs and thermal output. The module incorporates advanced power management features that dynamically adjust power states based on system requirements, optimizing energy usage without compromising performance.

Performance Characteristics

CL46 Latency Specification

The module operates at CAS Latency 46 (CL46), which represents the number of clock cycles between the memory controller sending a column address and the first piece of data becoming available. While this latency figure may appear higher than DDR4 equivalents, it's important to consider this within the context of DDR5's significantly higher clock speeds and improved overall architecture. The CL46 timing is optimized for the 6400 MT/s operating speed, delivering excellent real-world performance in server applications.

Advanced Timing Features

Beyond the primary CAS latency, the HMCG78AHBRA476N implements numerous secondary and tertiary timing parameters that collectively determine overall memory performance. These include tRCD (RAS to CAS Delay), tRP (RAS Precharge Time), and tRAS (Active to Precharge Delay), all carefully optimized to balance performance with stability in server environments. The timing calibration ensures reliable operation across varying system configurations and environmental conditions.

Bandwidth and Data Transfer Capabilities

Bandwidth

With its 6400 MT/s data rate, the HMCG78AHBRA476N delivers substantial theoretical bandwidth. For a 64-bit memory interface operating at 6400 MT/s, the calculated peak bandwidth reaches approximately 51.2 GB/s per module. This substantial bandwidth enables efficient handling of data-intensive server workloads, including database operations, virtualization, and high-performance computing applications. The efficient data transfer mechanism ensures minimal bottlenecks in memory-intensive operations.

Real-World Performance Considerations

While theoretical bandwidth provides important baseline metrics, real-world performance depends on multiple factors including memory controller efficiency, system architecture, and workload characteristics. The module's design optimizes for actual server workload patterns, providing consistent performance across varying access patterns and request sizes. The advanced prefetch algorithms and bank management features further enhance effective bandwidth in practical deployment scenarios.

288-Pin DIMM

The module utilizes a 288-pin DIMM form factor specifically designed for DDR5 memory technology. This physical interface differs from previous DDR generations, featuring a modified pin layout and keying mechanism to prevent incorrect installation in incompatible slots. The pin configuration includes dedicated contacts for power delivery, data signals, command/address lines, and sideband signals for advanced management functions.

Physical Dimensions and Mounting

Standard DDR5 RDIMM dimensions ensure compatibility with server chassis and cooling solutions designed for enterprise hardware. The module maintains industry-standard height and profile specifications while incorporating necessary components for server-grade reliability. The physical design includes secure mounting features and clear identification markings for proper handling and installation in data center environments.

Server Platform Compatibility

The HMCG78AHBRA476N is engineered for compatibility with server platforms supporting DDR5 memory technology. This includes modern server architectures from major manufacturers that incorporate DDR5 memory controllers. The module's SPD (Serial Presence Detect) contains comprehensive configuration data that enables automatic recognition and optimal configuration in supported systems. Compatibility extends across various server form factors including rack servers, tower servers, and high-density computing platforms.

Advanced DDR5 Features

Beyond the standard ECC functionality, DDR5 architecture incorporates on-die ECC that provides additional error correction within the DRAM chips themselves. This two-tiered ECC approach enhances overall memory subsystem reliability by addressing errors at their source. The HMCG78AHBRA476N leverages this advanced error correction architecture to deliver exceptional data integrity for critical server applications.

Signal Integrity and Data Integrity

The module implements Decision Feedback Equalization technology, which improves signal integrity at high data rates by reducing intersymbol interference. This advanced signal processing technique enables reliable operation at 6400 MT/s while maintaining timing margins and data accuracy. The DFE implementation is particularly valuable in server environments where signal integrity challenges increase with higher memory capacities and operating frequencies.

Application and Use Case Scenarios

Data Center and Cloud Applications

The Hynix HMCG78AHBRA476N is ideally suited for modern data center environments and cloud computing infrastructure. Its combination of high bandwidth, reliability features, and power efficiency makes it appropriate for virtualization hosts, database servers, and application hosting platforms. The module's performance characteristics support the demanding requirements of multi-tenant environments and scalable cloud services.

High-Performance Computing

In technical computing and HPC environments, the module's bandwidth capabilities support computationally intensive workloads including scientific simulations, engineering analysis, and research applications. The balanced performance characteristics efficiently handle both compute-bound and memory-bound workloads common in technical computing scenarios.

Storage and Memory-Intensive Workloads

For storage servers and memory-intensive applications including in-memory databases and caching solutions, the module provides optimal performance characteristics. The combination of capacity, bandwidth, and reliability features supports demanding storage workloads while maintaining data integrity essential for storage system operation.