SK hynix 64GB DDR5-6400 ECC RDIMM Server Memory Module HMCG94BHBRA

Brand: SK Hynix | Category: Memory (RAM)

SKU: HMCG94BHBRA | Part #: HMCG94BHBRA

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Product Overview

The SK hynix 64GB DDR5-6400 ECC RDIMM is a cutting-edge registered server memory module engineered to meet the exacting demands of modern enterprise data centres, high-performance computing environments, and cloud-native infrastructure. Operating at a blazing 6400 MT/s data transfer rate, this module represents the leading edge of DDR5 server memory technology, delivering nearly double the bandwidth of its DDR4 predecessors while simultaneously reducing power consumption per bit transferred.

SK hynix, one of the world's premier semiconductor manufacturers, has designed the HMCG94BHBRA to serve mission-critical applications where both capacity and reliability are non-negotiable. The 64GB density per DIMM allows administrators to maximise memory capacity in high-density server chassis without exhausting DIMM slot allocations — a critical advantage in platforms supporting large in-memory databases, virtualisation hypervisors, and AI inference workloads. With on-die ECC, registered buffering, and full JEDEC DDR5 compliance, this module is a foundational building block for enterprise-class compute infrastructure.

Key Features & Benefits

• Ultra-High Speed at 6400 MT/s: Operates at DDR5-6400, providing exceptional memory bandwidth that accelerates latency-sensitive enterprise applications, AI inference pipelines, and in-memory analytics platforms.
• 64GB High Density per DIMM: Maximises usable memory capacity per slot, enabling servers to reach terabyte-scale RAM configurations without saturating available DIMM slots — ideal for memory-intensive workloads.
• ECC Error Correction: Integrated Error Correction Code (ECC) detects and corrects single-bit memory errors on-the-fly, ensuring continuous uptime and data integrity in production environments where silent data corruption is unacceptable.
• Registered (RDIMM) Buffering: The register buffer on the control bus reduces electrical load on the memory controller, enabling stable multi-DIMM-per-channel configurations and extending the scalability of large memory subsystems.
• DDR5 On-Die ECC (ODECC): Beyond system-level ECC, DDR5 architecture incorporates on-die ECC within each DRAM die, providing an additional layer of hardware-level error scrubbing before data reaches the memory controller.
• Reduced Power Consumption: DDR5 operates at a lower 1.1V supply voltage compared to DDR4's 1.2V, translating directly into reduced thermal output and lower total cost of ownership in high-density rack deployments.
• JEDEC DDR5 Standard Compliance: Fully compliant with JEDEC JESD79-5 DDR5 standards, ensuring broad platform interoperability and validated compatibility with leading server OEM qualification lists.
• Decentralised Power Management: DDR5 moves voltage regulation onto the DIMM itself via the Power Management IC (PMIC), improving power delivery accuracy, reducing motherboard complexity, and enhancing signal integrity at high speeds.

Technical Architecture

The HMCG94BHBRA is built on SK hynix's advanced DRAM process technology, utilising high-density 16Gb DDR5 DRAM dies arranged across both sides of the PCB to achieve the 64GB capacity. As a Registered DIMM (RDIMM), the module incorporates a Registering Clock Driver (RCD) — also known as a register buffer — that re-drives the command, address, and control signals from the memory controller. This buffering reduces the electrical load seen by the host CPU's integrated memory controller (iMC), which is essential when populating multiple DIMMs per channel and ensures clean signal integrity at 6400 MT/s transfer rates.

DDR5 introduces a fundamentally revised internal architecture compared to DDR4. Each DDR5 DIMM contains two independent 32-bit sub-channels (rather than a single 64-bit channel), effectively doubling the number of independent command/address interfaces. This dual sub-channel architecture improves memory access granularity and can reduce latency for certain access patterns by allowing finer-grained scheduling by the memory controller. The PMIC (Power Management Integrated Circuit) mounted on the DIMM regulates the 1.1V core voltage and other required supply rails internally, receiving a 12V or 5V input from the server board, which simplifies motherboard power delivery design and improves voltage regulation precision.

The module's SPD (Serial Presence Detect) EEPROM stores timing parameters, voltage requirements, manufacturer data, and XMP/EXPO profiles that allow the host system's BIOS or UEFI to automatically configure optimal operating parameters during POST initialisation. SK hynix's rigorous validation and binning processes ensure every module shipped meets or exceeds its rated speed and latency specifications across the full industrial temperature range.

Performance & Capacity

At DDR5-6400 with a 64-bit effective channel width (dual 32-bit sub-channels), a single HMCG94BHBRA module delivers a theoretical peak bandwidth of approximately 51.2 GB/s per channel. In dual-channel configurations across a standard two-DIMM-per-channel server platform, aggregate bandwidth can reach over 100 GB/s, providing substantial headroom for bandwidth-hungry workloads such as large language model (LLM) inference, HPC simulations, and real-time analytics.

The 64GB capacity per DIMM means a dual-socket server platform with eight DIMM slots per CPU (sixteen total) can achieve 1TB of total system RAM — sufficient for large-scale in-memory databases such as SAP HANA, Oracle TimesTen, or Redis Enterprise running at enterprise scale. Platforms supporting 12 DIMMs per processor can reach 1.5TB in a 2-socket configuration, enabling consolidated virtualisation environments that previously required multiple physical hosts.

Memory latency, while higher in absolute nanosecond terms than DDR4 at equivalent clock speeds due to the higher CAS latency multipliers inherent to DDR5, is partially compensated by the significantly higher bandwidth and improved burst efficiency, resulting in net performance improvements for throughput-bound workloads that constitute the majority of enterprise server use cases.

Compatibility & Integration

The SK hynix HMCG94BHBRA is designed for server platforms based on Intel Xeon Scalable (Sapphire Rapids and successors) and AMD EPYC (Genoa and successors) processors, both of which natively support DDR5 memory channels. The module adheres fully to JEDEC JESD79-5 DDR5 specifications and is compatible with server motherboards from major OEMs including Supermicro, Dell PowerEdge (select DDR5 platforms), HPE ProLiant Gen11, Lenovo ThinkSystem, and Inspur NF series.

• Interface: DDR5 SDRAM, 288-pin RDIMM form factor
• Standards: JEDEC JESD79-5 DDR5, SPD EEPROM per JEDEC standards
• Operating Systems: Compatible with all major enterprise OS platforms including Red Hat Enterprise Linux, SUSE Linux Enterprise Server, Windows Server 2022/2025, VMware vSphere 8.x, and Proxmox VE
• Certifications: Manufactured under ISO 9001 quality management; complies with RoHS and REACH environmental directives
• ECC Support: Requires ECC-capable memory controller (standard on all server-grade CPUs supporting RDIMM)

Ideal Use Cases

• AI & Machine Learning Inference Servers: High-bandwidth DDR5-6400 memory directly accelerates token throughput and batch processing in GPU-attached inference platforms where CPU-side memory bandwidth is a bottleneck in data pre-processing and model serving pipelines.
• Large-Scale Virtualisation Hosts: VMware vSphere, Microsoft Hyper-V, and KVM hypervisor hosts benefit enormously from high-density 64GB DIMMs, enabling dense VM consolidation ratios while maintaining per-VM memory allocations for SLA-backed workloads.
• In-Memory Database Platforms: SAP HANA, VoltDB, MemSQL (SingleStore), and Redis Enterprise require massive contiguous memory pools; the HMCG94BHBRA provides the capacity and ECC reliability mandatory for financial-grade in-memory transaction processing.
• High-Performance Computing (HPC) Clusters: Computational fluid dynamics, genomics sequencing pipelines, finite element analysis, and climate modelling simulations require both high memory bandwidth and large working set sizes — exactly the profile this module addresses.
• Cloud Service Provider Infrastructure: Hyperscale and regional cloud providers building bare-metal-as-a-service or container-as-a-service platforms benefit from the capacity density and power efficiency of DDR5-6400 RDIMMs to lower per-unit memory cost at scale.
• OLAP & Data Warehousing: Columnar analytics engines such as ClickHouse, Apache Druid, and Snowflake on-premises deployments thrive on high-bandwidth memory subsystems that can feed wide vectorised query execution engines without stalling on memory reads.
• Telecom Network Function Virtualisation (NFV): 5G core network functions including vEPC, vRAN baseband processing, and packet core virtualisation demand deterministic low-latency memory access combined with ECC reliability — requirements the HMCG94BHBRA is purpose-built to satisfy.

Why Buy from Omnixon

Omnixon Global is a trusted B2B IT hardware distributor headquartered in Dubai, UAE, with established supply chains serving enterprise clients across the GCC region including Saudi Arabia, Qatar, Kuwait, Bahrain, Oman, and the UAE, as well as international customers across Europe, Africa, and Asia-Pacific. Sourcing server memory through Omnixon means working with a partner that understands the unique procurement requirements of regional enterprise IT teams — from VAT-compliant invoicing and Arabic-language support to the logistical demands of mission-critical infrastructure refresh cycles. Our inventory of SK hynix enterprise memory modules is held in-region, minimising customs and clearance complexity for GCC-based data centre operators. Omnixon's technical pre-sales team can assist with platform compatibility verification, bill-of-materials planning for large memory configurations, and integration with complementary compute and storage hardware. Every module we supply is brand new, factory-sealed, and sourced through authorised distribution channels, giving enterprise procurement teams the confidence they need when specifying memory for Tier 1 production workloads.

Related Products & Ecosystem

The SK hynix 64GB DDR5-6400 ECC RDIMM is most effectively deployed as part of a complete server memory strategy. Omnixon also supplies complementary products across related categories including enterprise-grade CPUs (Intel Xeon Scalable and AMD EPYC processors that natively support DDR5), high-performance NVMe enterprise SSDs for storage tiering below the memory layer, GPU accelerators for AI and HPC workloads that pair with high-bandwidth memory subsystems, and complete server platforms from leading OEMs including Dell EMC PowerEdge, HPE ProLiant, Supermicro, and Lenovo ThinkSystem. For infrastructure surrounding your compute nodes, Omnixon provides server rack enclosures, rack PDUs, UPS and power protection systems, and high-speed network switches and adapters to complete the data centre stack. Contact our enterprise sales team to discuss memory configuration planning, bulk procurement requirements, or full rack integration projects.