HMCG78AHBRA284N Hynix 16GB DDR5 6400MT/s PC5-51200 CL52 ECC RDIMM Memory

Hynix HMCG78AHBRA284N 16GB Memory Module

The Hynix HMCG78AHBRA284N features a single 16GB memory module organized as 1Rx8 (single rank, eight bank groups). This configuration provides optimal balance between performance and compatibility across various server platforms. The module utilizes advanced DDR5 technology with enhanced data transfer rates and improved power efficiency compared to previous DDR4 generations.

Performance Characteristics

Operating at 6400MT/s (mega transfers per second), this DDR5 module delivers a peak transfer rate of 51.2 GB/s. The PC5-51200 designation confirms compliance with JEDEC standards for DDR5-6400 modules. The module operates at a low voltage of 1.1V, representing significant power efficiency improvements over DDR4 modules while maintaining higher performance levels.

Memory Technology

Built using Hynix's advanced semiconductor manufacturing process, this RDIMM incorporates Error Correction Code (ECC) functionality with registered buffering. The 288-pin design follows the standard DDR5 RDIMM form factor, ensuring compatibility with supported server platforms. The module features on-die ECC for improved reliability and data integrity.

Timing Parameters

The module operates at CAS Latency 52 (CL52) timing, optimized for server workloads where stability and reliability are paramount. The timing configuration ensures consistent performance under sustained operation while maintaining data integrity through advanced error correction mechanisms.

DDR5 Technology Advancements

DDR5 introduces a revolutionary dual sub-channel architecture within each module, effectively doubling the burst length from 8 to 16 while maintaining the same burst chop length of 8. This architectural enhancement allows for more efficient data transfer and improved memory access patterns, particularly beneficial for server applications requiring high bandwidth.

Data Rate Progression

Operating at 6400MHz, this module represents a substantial performance increase over previous DDR4 generations, which typically maxed out at 3200MHz for server applications. The doubled data rate enables higher bandwidth capabilities essential for modern server workloads including virtualization, database operations, and high-performance computing tasks.

Error Correction and Reliability Features

ECC Technology Implementation

The module incorporates sophisticated on-die Error Correction Code technology that corrects errors within the DRAM chips before data leaves the device. This internal error correction capability enhances reliability by addressing soft errors at their source, providing an additional layer of data protection beyond traditional ECC functionality.

Registered ECC Benefits

As a Registered ECC DIMM (RDIMM), this module includes both register chips for command and address signals and additional DRAM chips for ECC data storage. This configuration enables single-bit error correction and double-bit error detection, crucial for maintaining data integrity in mission-critical server environments where uninterrupted operation is essential.

Signal Integrity Enhancements

The registered design incorporates advanced signal buffering technology that improves signal integrity in memory-intensive systems with multiple modules. This buffering reduces electrical load on the memory controller, enabling support for higher module densities and greater numbers of modules per channel while maintaining signal quality and system stability.

Server Platform Compatibility

This DDR5 RDIMM is designed for compatibility with server platforms supporting DDR5 memory technology. The module requires motherboards with DDR5 memory controllers and appropriate BIOS support. Compatibility spans various server architectures including latest-generation Intel Xeon Scalable processors and AMD EPYC platforms with DDR5 support.

Performance Characteristics

Bandwidth and Latency Metrics

The 6400MT/s data rate combined with the 64-bit data bus width delivers a theoretical peak bandwidth of 51.2 GB/s per module. This calculation derives from the formula: (6400 million transfers/second × 64 bits/transfer) / 8 bits/byte = 51,200 MB/s. In multi-channel server configurations, this bandwidth scales linearly with the number of populated memory channels.

Real-World Performance Expectations

Actual performance varies based on system configuration, workload characteristics, and memory population. The CL52 timing provides optimized balance between latency and bandwidth for server applications, where sustained throughput often outweighs absolute latency considerations. Performance testing demonstrates consistent operation at specified speeds under varying load conditions.

Server Workload Optimization

The module's performance characteristics are particularly beneficial for memory-intensive server applications including database management systems, virtualization platforms, and high-performance computing workloads. The combination of high bandwidth and ECC protection ensures reliable operation during extended processing tasks with large datasets.

Scalability Considerations

When deployed in multi-module configurations, the registered design maintains signal integrity across populated channels, enabling scalable memory capacity without performance degradation. The 1Rx8 organization supports higher module counts per channel compared to 2Rx4 configurations, providing flexibility for both capacity and performance-oriented server deployments.