HMCG78AHBRA Hynix 16GB (1x16gb) DDR5 6400MHz PC5-51200 1rx8 ECC Registered 1.1v Cl52 Sdram 288-pin Rdimm Memory Module

Hynix HMCG78AHBRA 16GB DDR5 Memory Module

The Hynix HMCG78AHBRA represents a significant advancement in server memory technology, delivering exceptional performance, reliability, and power efficiency for modern data center environments, enterprise servers, and high-performance computing applications. This 16GB DDR5 module operates at 6400MT/s (Millions of Transfers per second), providing substantial bandwidth improvements over previous DDR4 generations while maintaining critical error-correcting capabilities through ECC technology.

Key Specifications at a Glance

This memory module features a single 16GB capacity on a 288-pin RDIMM form factor, operating at a nominal voltage of 1.1V with CAS Latency of 52. The module utilizes a 1Rx8 organization and incorporates Registered ECC functionality for enhanced signal integrity and error correction in demanding server environments.

DDR5 Technological Advancements

The Hynix HMCG78AHBRA leverages the revolutionary architecture of DDR5 technology, which introduces several key improvements over DDR4. The module features a burst length of 16, compared to DDR4's burst length of 8, effectively doubling the data transfer efficiency. The command/address bus operates at a reduced voltage level while maintaining robust signal integrity through improved equalization and decision feedback equalization (DFE) capabilities.

On-Die ECC Implementation

DDR5 technology incorporates on-die ECC (Error Correction Code) that corrects errors within the DRAM die itself before they can affect system performance. This internal error correction works in conjunction with the module's traditional ECC functionality to provide comprehensive data protection. The on-die ECC addresses single-bit errors that may occur during cell refresh operations or due to physical characteristics of the memory cells, ensuring higher reliability and data integrity at the most fundamental level.

Performance Characteristics

Bandwidth and Data Transfer Rates

Operating at 6400MHz (PC5-51200), the Hynix HMCG78AHBRA delivers a peak transfer rate of 51.2 GB/s per module. This substantial bandwidth improvement over DDR4 modules, which typically operate at 3200MHz (PC4-25600) with 25.6 GB/s bandwidth, represents a 100% increase in theoretical maximum data transfer rates. The improved bandwidth directly translates to faster application loading times, reduced latency in memory-intensive operations, and enhanced overall system responsiveness.

Latency Considerations

While the CAS Latency of 52 may appear higher than typical DDR4 modules (which commonly feature CL22 or CL24), the actual absolute latency in nanoseconds is comparable or improved due to the significantly higher clock speeds. The CAS Latency of 52 cycles at 6400MHz translates to approximately 16.25 nanoseconds, which is competitive with high-performance DDR4 modules while providing substantially greater bandwidth. The module's timing parameters are optimized for server workloads where sustained throughput often outweighs minimal latency improvements.

Power Consumption

Under typical operating conditions, the Hynix HMCG78AHBRA consumes approximately 4.5-5.5 watts during active operation, with reduced power states available during periods of lower utilization. The module supports various power-down modes and self-refresh states that significantly reduce power consumption during idle periods, making it particularly suitable for cloud computing environments where power efficiency directly correlates with operational expenses.

Form Factor

The Hynix HMCG78AHBRA utilizes the standard 288-pin Registered DIMM (RDIMM) form factor, measuring 133.35mm in length and 31.25mm in height. The module features a single notch position that is different from DDR4 modules, preventing accidental insertion into incompatible memory sockets. The physical design incorporates a balanced PCB with multiple layers to ensure signal integrity at high frequencies, with carefully controlled impedance characteristics for reliable operation in demanding server environments.

Registered ECC Architecture

The Hynix HMCG78AHBRA implements a comprehensive Registered ECC (Error Correcting Code) architecture that provides single-error correction and double-error detection (SECDED) capabilities. This advanced error correction ensures data integrity by automatically detecting and correcting single-bit errors while identifying multi-bit errors. The registered component of the design includes address and command registers that reduce electrical load on the memory controller, enabling support for higher memory capacities and more DIMMs per channel while maintaining signal integrity.

Reliability

This DDR5 module supports Post-Package Repair capabilities, allowing the system to remap faulty memory cells that may develop during the module's operational life. When the ECC logic detects persistent errors in specific memory locations, the system can reconfigure the memory address mapping to exclude these problematic cells, effectively extending the module's usable lifespan and maintaining system reliability without immediate hardware replacement.

Wide Compatibility

The Hynix HMCG78AHBRA is designed for compatibility with server platforms supporting DDR5 Registered ECC memory modules. This includes next-generation server processors from major manufacturers that feature integrated memory controllers with DDR5 support. The module operates in systems that require 1.1V DDR5 memory and is specifically engineered for platforms that benefit from the improved bandwidth and capacity capabilities of DDR5 technology.

Applications and Use Cases

Enterprise Server Environments

The Hynix HMCG78AHBRA is ideally suited for enterprise server applications where reliability, performance, and data integrity are paramount. These include database servers, application servers, and virtualization hosts that benefit from the increased bandwidth and robust error correction capabilities of DDR5 technology. The module's registered design enables support for large memory configurations essential for memory-intensive enterprise applications.

High-Performance Computing

In high-performance computing (HPC) environments, the substantial bandwidth improvement offered by the Hynix HMCG78AHBRA directly accelerates computational workloads, scientific simulations, and engineering applications. The module's efficient power consumption characteristics make it particularly valuable in large-scale HPC deployments where power and cooling infrastructure represent significant operational expenses.

Cloud Infrastructure

Cloud service providers benefit from the density, performance, and power efficiency of the Hynix HMCG78AHBRA in hyper-scale deployments. The module's reliability features reduce the frequency of hardware-related service interruptions, while the improved bandwidth supports higher virtual machine density and better performance for memory-intensive cloud applications.

Comparative Analysis with Previous Generations

DDR5 vs. DDR4 Performance Metrics

The transition from DDR4 to DDR5 technology represented by the Hynix HMCG78AHBRA brings substantial improvements across multiple performance dimensions. While DDR4 modules typically top out at 3200MT/s in server applications, the HMCG78AHBRA operates at 6400MT/s, doubling the theoretical bandwidth. The architectural improvements in DDR5, including bank grouping and burst length enhancements, provide additional performance benefits beyond the raw frequency increase.

Power Efficiency Comparison

Despite the significant performance increase, the Hynix HMCG78AHBRA operates at a lower voltage (1.1V vs. 1.2V) compared to DDR4 modules, resulting in improved performance per watt. The integrated voltage regulator further enhances power efficiency by providing more precise voltage control and reducing power distribution losses.