SK Hynix 128GB DDR5-6400 RDIMM PC5-51200R Dual Rank x4 Module

Brand: SK Hynix | Category: Memory (RAM)

SKU: SK -HMCT04MHBRC | Part #: HMCT04MHBRC | MPN: HMCT04MHBRC

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SK Hynix has engineered the 128GB DDR5-6400 RDIMM module (part number HMCT04MHBRC) as a purpose-built solution for enterprise and data-centre environments that demand both capacity and reliability at scale. The critical detail that determines platform fit before any performance metric is the RDIMM form factor paired with dual-rank (2Rx4) configuration. This combination narrows your viable motherboard and server platforms significantly—you need systems designed to accept registered memory with built-in buffer chips that isolate the memory controller from the DIMM itself. For infrastructure teams evaluating procurement, this means the HMCT04MHBRC is not a drop-in replacement for consumer-grade UDIMMs or even for single-rank configurations. The dual-rank architecture allows the memory subsystem to interleave requests across two independent rank sets, which reduces per-rank loading and improves signal integrity under heavy, sustained workloads—precisely what you encounter in virtualised environments, database clusters, and AI training infrastructure.

The ECC (Error-Correcting Code) capability is non-negotiable for any enterprise deployment, and SK Hynix has included full ECC support in the HMCT04MHBRC. This means every 64-bit data word is protected by an additional 8-bit checksum, allowing the system to detect and correct single-bit errors on the fly and detect (but not correct) multi-bit errors. For storage architects and infrastructure managers making long-term procurement decisions, ECC presence eliminates a class of silent data corruption that would otherwise go undetected until it causes application failures, audit log discrepancies, or worse—corrupted database transactions. SK Hynix's reputation in enterprise memory stems partly from conservative design margins and rigorous qualification; pairing that with ECC means you are not just buying capacity, you are buying data integrity insurance that costs nothing to activate but saves enormous amounts of troubleshooting and risk mitigation downstream.

The DDR5-6400 speed rating (also expressed as PC5-51200R in JEDEC nomenclature) and 1.1V operating voltage place this module squarely in the mainstream DDR5 performance envelope. The 6400 MT/s (megatransfers per second) specification represents the maximum frequency at which SK Hynix guarantees the HMCT04MHBRC will function reliably across its rated voltage and temperature range. CAS latency of 52 cycles is typical for DDR5-6400 modules; while it appears high compared to DDR4 latencies, it reflects the deeper pipeline required to reach higher absolute frequencies. In absolute nanoseconds, the latency difference between DDR5-6400 and older DDR4-3200 systems is often smaller than the generational speed gain would suggest. For workloads where latency-sensitive operations dominate (real-time financial systems, low-latency networking stacks), this matters; for throughput-bound workloads (analytics, machine learning inference batch jobs, backup operations), the sustained bandwidth advantage of DDR5-6400 is the metric that governs performance.

The 128GB per-module capacity is designed for infrastructure where consolidation is a cost priority. Rather than populating a system with sixteen 8GB modules, a single HMCT04MHBRC slot delivers the same capacity in one DIMM, leaving other slots free for future expansion or reducing the total slot count required in memory-constrained chassis designs. Many enterprise systems support four or eight DIMM slots; fitting 128GB in one slot means you can build 512GB or 1TB systems without maxing out the physical memory bus or requiring exotic, power-hungry configurations. This appeals directly to platform architects and procurement teams evaluating cost per gigabyte, space efficiency, and power draw per unit of capacity. SK Hynix manufactures the HMCT04MHBRC to the same reliability standards as smaller-capacity modules, so the increase in density does not introduce additional failure modes or thermal risk.

SK Hynix's engineering discipline shows in the part number HMCT04MHBRC itself: the nomenclature encodes manufacturing date codes, internal revision levels, and qualification status that procurement and inventory teams can decode for traceability. If you are ordering memory for multiple systems or refresh cycles, the ability to track and match revision levels across purchases ensures consistent behaviour in large deployments. System administrators and network engineers responsible for keeping infrastructure stable and predictable understand the value of that consistency; a memory revision swap that looks identical but alters timing parameters by a few picoseconds can introduce intermittent failures that consume hundreds of debug hours. SK Hynix's track record of backward compatibility and stable firmware support across product lifecycles reinforces confidence that the HMCT04MHBRC will not become a support liability as server BIOS updates and operating system patches accumulate over 3–5 years of service life.

Enterprise Deployment Specifications

• Registered DIMM (RDIMM) form factor with integrated buffer chip—mandatory for high-density memory subsystems and large server farms requiring signal isolation and reduced electrical loading on the memory controller.
• Dual-rank (2Rx4) organisation with 128GB total capacity per module, enabling server designs to achieve 512GB or 1TB configurations without maxing out physical DIMM slot count.
• Full ECC protection on all data bits plus support for additional SECDED (single-error correction, double-error detection) modes where the platform firmware provides the logic.
• DDR5-6400 speed rated at 1.1V core voltage, with CAS latency of CL52 and full JEDEC PC5-51200R compliance for interoperability across qualified platforms.
• Part number HMCT04MHBRC includes manufacturer revision coding and production date traceability, enabling procurement teams to match modules for multi-system deployments and future inventory cross-checks.
• Qualification tested for use in server-class systems from major OEMs including Lenovo ThinkSystem, Dell PowerEdge, and HPE ProLiant lines that support registered DDR5 memory.

Omnixon Global stocks the SK Hynix HMCT04MHBRC and similar enterprise memory modules from multiple vendors for immediate availability across the GCC, India, and Southeast Asia regions. Our procurement team maintains relationships with SK Hynix directly, ensuring supply chain resilience and support for volume orders with technical documentation and compatibility verification. If your data-centre, AI infrastructure team, or enterprise IT department requires qualified memory for a specific server platform, we invite you to submit a request for quotation. Omnixon Global's technical sales team can cross-reference your system configuration, confirm BIOS and firmware compatibility, and provide delivery timelines tailored to your deployment window.