HMCG78MEBRA115N Hynix 16GB PC5-38400 Single Rank Memory Module

Hynix HMCG78MEBRA115N — 16GB DDR5 Server Memory

Quick Product Snapshot

This listing describes the Hynix HMCG78MEBRA115N — a single 16GB DDR5 SDRAM module that supports PC5-38400 / DDR5-4800MHz speeds. It is an ECC Registered RDIMM designed for improved data integrity and stable multi-module operation.

General Identification

• Manufacturer: SK Hynix
• Model / P/N: HMCG78MEBRA115N
• Product type: 16GB DDR5 SDRAM memory module

Technical Details

• Capacity: 16GB (single module)
• Memory standard: DDR5 SDRAM
• Speed / Bandwidth: 4800 MT/s — PC5-38400
• Module count: 1 × 16GB
• ECC: Yes — Error-Correcting Code for enhanced reliability
• Registered / Buffered: Registered (RDIMM)
• CAS Latency: CL40
• Rank: Single rank (1Rx8)

Key Advantages & Benefits

• Stability: Registered buffering reduces electrical load on the memory controller.
• Data integrity: ECC (error-correcting code) corrects single-bit errors on the fly.
• Performance: 4800MT/s transfer rate (DDR5-4800) for faster throughput than DDR4.
• Low-latency operation: CL40 timings tuned for reliable server performance.
• Compact footprint: Standard 288-pin RDIMM form factor for compatible motherboards.

Physical & Shipping Information

• Form factor / Pins: 288-pin RDIMM
• Shipping dimensions (approx.): 1.00" (H) × 6.75" (D)

Compatibility  

• Motherboard supports DDR5 RDIMM (288-pin) modules
• Server platform allows Registered ECC memory
• Mixing generations (e.g., DDR4) is not supported — use DDR5 modules only

Hynix HMCG78MEBRA115N 16GB DDR5 Server Memory

Next-Generation Memory Technology

The Hynix HMCG78MEBRA115N represents the cutting edge of server memory technology, delivering unprecedented performance, reliability, and efficiency for modern data center environments. As part of the DDR5 memory family, this module marks a significant leap forward from previous DDR4 generations, offering substantial improvements in speed, capacity, and power management that are essential for today's demanding computational workloads.

Revolutionary DDR5 Architecture

DDR5 technology introduces fundamental architectural changes that distinguish it from earlier memory standards. The Hynix HMCG78MEBRA115N leverages these innovations to provide superior performance characteristics that are specifically engineered for server applications requiring high throughput and exceptional reliability.

Core Architectural Enhancements

Unlike DDR4 modules, DDR5 incorporates a dual sub-channel architecture that allows for more efficient data access patterns and reduced latency. This design enables the memory controller to access two separate 32-byte data blocks simultaneously, effectively doubling the burst length and improving overall memory efficiency in server environments where parallel processing is critical.

Detailed Technical Specifications

Memory Module Configuration

The Hynix HMCG78MEBRA115N is engineered with precision to meet the rigorous demands of enterprise server systems. Each specification has been optimized to deliver maximum performance while maintaining system stability and data integrity.

Capacity and Organization

This module features a substantial 16GB capacity organized in a single-rank configuration. The 1Rx8 organization indicates eight memory devices per rank with a 64-bit data bus, providing optimal balance between capacity and signal integrity. This configuration is particularly well-suited for systems requiring moderate memory density with excellent performance characteristics.

Memory Device Technology

Built using Hynix's advanced semiconductor manufacturing processes, the memory chips feature high-density storage cells with optimized transistor design. This technology enables the module to achieve its 4800MHz operating frequency while maintaining low power consumption and excellent thermal characteristics, crucial for 24/7 server operation.

Performance Characteristics

Operating at PC5-38400 (DDR5-4800MHz), this module delivers a peak transfer rate of 38,400 MB/s, representing a significant performance increase over previous generation DDR4 modules. The enhanced data rate enables faster application loading, improved database query performance, and more responsive virtual machine operation.

Timing Parameters

The module operates with carefully calibrated timing parameters that balance performance and stability. While specific timing values may vary based on system configuration and BIOS settings, the Hynix HMCG78MEBRA115N is optimized for enterprise workloads where consistent performance is more critical than absolute lowest latency.

ECC and Registered Memory Technology

Error Correcting Code (ECC) Protection

Enterprise environments demand the highest levels of data integrity, and the Hynix HMCG78MEBRA115N delivers through its advanced ECC capabilities. Error Correcting Code technology is essential for preventing data corruption and system crashes that can result from memory errors.

How ECC Protects Your Data

ECC memory includes additional bits that are used to detect and correct single-bit errors automatically. When data is written to memory, the ECC logic calculates check bits based on the data pattern. Upon reading, these check bits are recalculated and compared to the stored values. If a single-bit error is detected, it is corrected transparently without interrupting system operation or requiring user intervention.

Multi-Bit Error Detection

Beyond single-bit error correction, the ECC implementation in this DDR5 module can detect multi-bit errors, providing an additional layer of protection. While multi-bit errors cannot be corrected, their detection allows the system to initiate protective measures to prevent data corruption and system instability, making this memory ideal for mission-critical applications.

Registered Memory Architecture

The Hynix HMCG78MEBRA115N incorporates registered memory technology, which distinguishes it from unbuffered modules commonly used in consumer systems. Registered memory includes a register between the memory controller and the DRAM chips, serving as a signal buffer that improves signal integrity and enables higher memory capacities.

Benefits of Registered Memory

By reducing the electrical load on the memory controller, registered memory allows servers to support more memory modules and higher total memory capacity. This is particularly important in multi-processor systems and high-density server configurations where signal integrity challenges would otherwise limit expansion capabilities.

Improved System Stability

The registering of command and address signals minimizes timing skew and signal degradation that can occur across large memory arrays. This results in improved system stability, especially important in enterprise environments where system uptime and reliability are paramount. The registered design also contributes to better power distribution and thermal management across the memory subsystem.

DDR5 Performance Advantages

Speed and Bandwidth Improvements

The transition to DDR5 technology brings substantial performance benefits that are immediately apparent in server applications. The Hynix HMCG78MEBRA115N operates at 4800MHz, providing a significant bandwidth increase over DDR4 modules typically operating at 3200MHz or lower frequencies.

Real-World Performance Impact

In server environments, the increased bandwidth translates directly to improved application performance, particularly for memory-intensive workloads such as database operations, virtualization, and scientific computing. The higher data transfer rates enable faster processing of large datasets and more responsive performance under heavy user loads.

Bandwidth Comparison with Previous Generations

Compared to DDR4-3200 modules, the Hynix DDR5-4800 module offers approximately 50% more theoretical bandwidth. This performance uplift is achieved while maintaining similar power consumption, resulting in significantly improved performance per watt – a critical metric for modern data centers concerned with both performance and energy efficiency.

Power Management Innovations

DDR5 introduces sophisticated power management capabilities that go beyond what was possible with DDR4 technology. The Hynix HMCG78MEBRA115N incorporates these innovations to reduce overall power consumption while maintaining high performance levels.

On-Die Power Management

One of the most significant architectural changes in DDR5 is the movement of power management from the motherboard to the memory module itself. Each Hynix HMCG78MEBRA115N module includes its own power management IC (PMIC), which provides more precise voltage regulation and improved power delivery efficiency.

Voltage Regulation Benefits

The integrated PMIC allows for finer control over power delivery, reducing voltage losses and improving overall power efficiency. This distributed power architecture also reduces motherboard complexity and cost while providing more stable power to the memory chips, contributing to improved reliability and signal integrity, especially important in high-density server configurations.

Ideal Use Cases and Applications

The performance characteristics of the Hynix HMCG78MEBRA115N make it well-suited for a wide range of server applications where reliability, capacity, and performance are equally important considerations.

Data Center and Enterprise Applications

In traditional enterprise environments, this memory excels in applications such as database servers, where the combination of high bandwidth and ECC protection ensures both performance and data integrity. The 16GB capacity per module provides flexibility in configuring systems with optimal memory capacity for specific workload requirements.

Virtualization and Cloud Infrastructure

For virtualization hosts and cloud infrastructure, the Hynix DDR5 module supports higher virtual machine density and improved performance for memory-intensive workloads. The registered architecture enables larger memory configurations, essential for servers running multiple virtual machines or memory-hungry applications.

High-Performance Computing

In technical and scientific computing environments, the increased bandwidth of DDR5 memory accelerates data processing for simulations, analytics, and research applications. The ECC protection ensures computational accuracy, which is critical for scientific calculations and financial modeling where data integrity cannot be compromised.

Reliability and Durability Features

Enterprise-Grade Reliability

Hynix designs its server memory modules to meet the rigorous demands of 24/7 operation in data center environments. The HMCG78MEBRA115N incorporates multiple features that enhance reliability and extend product lifespan, ensuring consistent performance throughout its operational life.

Extended Testing and Validation

Each memory module undergoes comprehensive testing at multiple stages of the manufacturing process. This includes individual component testing, module-level testing, and system compatibility testing to ensure reliable operation across a range of server platforms and environmental conditions.