SK hynix 32GB DDR5-6400 ECC RDIMM Server Memory Module HMCG88CHBRA

Brand: SK Hynix | Category: Memory (RAM)

SKU: HMCG88CHBRA | Part #: HMCG88CHBRA | MPN: HMCG88CHBRA

Contact for Pricing — Request a Quote

Product Overview

The SK hynix 32GB DDR5-6400 ECC RDIMM represents the cutting edge of enterprise server memory technology. Built on SK hynix's advanced 1β (1-beta) DRAM node, this Registered Dual Inline Memory Module brings together unprecedented bandwidth, robust error-correction, and rock-solid registered signal integrity in a single 288-pin DDR5 package. Running at a rated speed of 6400 MT/s, it more than doubles the peak bandwidth available from legacy DDR4 platforms, enabling modern enterprise workloads — from AI inference and deep-learning training to in-memory databases and real-time analytics — to execute at a scale previously unattainable in standard 1U and 2U rack server form factors.

It is fully compliant with the JEDEC DDR5 standard and carries ECC (Error-Correcting Code) capability, making it the go-to choice for mission-critical deployments where data integrity cannot be compromised.

Key Features & Benefits

• DDR5-6400 Speed: Operates at 6400 MT/s, delivering up to 51.2 GB/s of theoretical peak bandwidth per module — a dramatic leap over DDR4-3200's 25.6 GB/s ceiling — reducing memory bottlenecks in compute-intensive workloads.
• 32GB Capacity per DIMM: A dense 32GB footprint per stick allows system architects to build high-memory configurations (up to 1.5 TB+ per dual-socket server) without exhausting all DIMM slots, preserving expandability for future growth.
• ECC (Error-Correcting Code): On-die and module-level ECC continuously detects and corrects single-bit errors while flagging multi-bit errors, protecting in-flight data and long-running transactional workloads against silent data corruption.
• Registered (RDIMM) Architecture: The integrated register/clock driver decouples the memory controller's electrical load from the DRAM chips, enabling larger memory capacities per channel and improved signal stability at high frequencies — essential for 4-channel and 8-channel DDR5 server platforms.
• On-Die ECC (ODECC): Each DRAM die incorporates its own internal ECC engine, catching bit errors at the chip level before they propagate to the host memory controller, providing an additional layer of data integrity beyond traditional ECC DIMMs.
• Lower Operating Voltage: DDR5 operates at 1.1 V compared to DDR4's 1.2 V, translating to measurable power savings across large-scale deployments with dozens or hundreds of DIMMs — directly reducing TCO and cooling overhead in the data centre.
• SPD Hub (SPD5): The DDR5 SPD hub architecture supports enhanced JEDEC SPD5 specification, enabling more granular power management, better thermal reporting, and improved compatibility validation with platform firmware (UEFI/BIOS).
• Thermal & Reliability: Manufactured to industrial-grade specifications, the module maintains stable operation across the enterprise temperature range and is designed for continuous uptime in high-density server chassis with active airflow.

Technical Architecture

DDR5 introduces a fundamentally redesigned electrical and logical architecture compared to its DDR4 predecessor. Each DDR5 RDIMM features two independent 32-bit sub-channels (instead of a single 64-bit channel), each with its own command/address bus. This sub-channel architecture reduces the number of DRAM devices that must respond to each command, lowering turnaround latency and improving burst efficiency — particularly beneficial for workloads with high degrees of memory-access parallelism such as AI training and OLAP queries.

The SK hynix HMCG88CHBRA module is built around high-density DRAM dies fabricated on SK hynix's 1β (1-beta) process node, which delivers higher cell density and improved power efficiency compared to the earlier 1α node. The Registered Buffer (RCD) on the RDIMM re-drives command, address, and control signals from the host CPU's memory controller to the DRAM array, allowing more physical DRAM devices to be populated per channel without exceeding the controller's fanout limits. This is critical for large-memory server configurations common in virtualisation hosts and in-memory database servers.

The module supports on-die ECC natively at the DRAM-die level, supplemented by the system-level ECC that the host memory controller manages. Together, these two ECC layers provide defence-in-depth error protection. The SPD5 hub manages DIMM identification, timing configuration, and power-state negotiation during POST, providing the platform BIOS with accurate operational parameters to maximise both performance and reliability without manual tuning.

Performance & Capacity

At DDR5-6400, each sub-channel delivers a peak theoretical bandwidth of approximately 25.6 GB/s, yielding a combined 51.2 GB/s per DIMM. In a fully populated dual-socket server with eight DDR5 channels per socket, aggregate memory bandwidth can exceed 800 GB/s — a figure that directly accelerates workloads bottlenecked by memory throughput, including large language model (LLM) inference, genomics pipelines, and real-time streaming analytics.

With a 32GB per-DIMM density, a 2-socket server equipped with 16 DIMM slots can achieve 512 GB of total system memory, while a 24-DIMM chassis can reach 768 GB — sufficient to host large in-memory datasets for SAP HANA, Oracle Database in-memory pools, and Redis enterprise clusters without resorting to storage-tier tiering. Latency at DDR5-6400 with standard JEDEC timings (CL46 or tighter vendor-tuned profiles) remains competitive, and the sub-channel architecture helps reduce effective latency for parallel memory accesses compared to single-channel DDR4 at equivalent capacities.

Compatibility & Integration

The SK hynix 32GB DDR5-6400 RDIMM is compatible with server platforms built on Intel Xeon Scalable (Sapphire Rapids and later) and AMD EPYC (Genoa/Bergamo and later) processors, both of which include native DDR5 memory controllers. It conforms to the JEDEC DDR5 SDRAM standard (JESD79-5) and the DDR5 RDIMM specification, ensuring interoperability across compliant server OEM platforms from leading manufacturers including Dell PowerEdge, HPE ProLiant, Lenovo ThinkSystem, Supermicro, and Inspur server lines.

• JEDEC DDR5 SDRAM (JESD79-5) compliant
• 288-pin RDIMM form factor
• Compatible with Intel Xeon Scalable (Sapphire Rapids / Emerald Rapids) platforms
• Compatible with AMD EPYC Genoa, Bergamo, and Siena processor families
• SPD5 hub for UEFI/BIOS auto-configuration
• RoHS compliant — meets environmental directives applicable in the UAE, EU, and GCC markets
• Works with major server management frameworks including iDRAC, iLO, and IPMI-compliant BMC solutions

Ideal Use Cases

• AI & Machine Learning Training: High memory bandwidth and large per-DIMM capacity accelerate data feeding to AI accelerators (GPUs/NPUs), reducing idle time during tensor operations and gradient computation in deep-learning frameworks such as PyTorch and TensorFlow.
• Large-Scale Virtualisation: Hypervisor hosts running VMware vSphere, Microsoft Hyper-V, or KVM benefit from maximised DIMM density and ECC reliability, supporting higher VM consolidation ratios and reduced memory overcommit risks.
• In-Memory Databases: Platforms like SAP HANA, Oracle TimesTen, Redis Enterprise, and MemSQL require terabyte-scale memory pools with guaranteed data integrity — exactly what high-density ECC RDIMMs provide.
• High-Performance Computing (HPC): Scientific simulations, computational fluid dynamics, and financial modelling workloads that process large matrices in memory gain substantial speedups from DDR5-6400's elevated bandwidth.
• OLAP & Real-Time Analytics: Columnar databases and analytics engines (ClickHouse, Snowflake on-premises, Apache Spark) process massive datasets faster when memory bandwidth is not a bottleneck, making DDR5-6400 RDIMMs a key infrastructure upgrade.
• Cloud & Colocation Infrastructure: Hyperscale and regional cloud providers building or refreshing DDR5-generation compute clusters gain improved price-per-core-memory-bandwidth ratios, optimising rack density and power budgets.
• ERP & Mission-Critical OLTP: Enterprise resource planning systems and high-transaction-rate databases running Oracle, SQL Server, or PostgreSQL benefit from ECC-protected memory that eliminates data-corruption-induced downtime.

Related Products & Ecosystem

Building a complete, high-performance server platform around SK hynix DDR5 RDIMMs involves careful selection of complementary components. Omnixon supplies a broad ecosystem of enterprise hardware to support full server builds and upgrades, including Intel Xeon Scalable and AMD EPYC processors that natively support DDR5 memory channels, enterprise NVMe SSDs for fast local storage tiering, GPU accelerators for AI and HPC workloads, high-speed network adapters and 100GbE/400GbE transceivers for low-latency cluster interconnects, and rack infrastructure including UPS units, rack-mount PDUs, and server enclosures.