SK Hynix 16GB DDR5-6400 RDIMM PC5-51200R Single Rank x8 Module

Brand: SK Hynix | Category: Memory (RAM)

SKU: SK -HMCG78AHBRA | Part #: HMCG78AHBRA | MPN: HMCG78AHBRA

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A modern data centre running 24 dual-socket servers with this SK Hynix 16GB DDR5-6400 module can populate 48 memory slots per rack, delivering 768GB of aggregate memory at a single speed grade. That ceiling matters: infrastructure teams—particularly memory architects and senior systems administrators planning capacity for virtualisation clusters, database workloads, or AI inference nodes—need to know the maximum memory density their hardware can support before committing to platform selection. The HMCG78AHBRA achieves that high-density footprint through its single-rank configuration and second-generation DDR5 silicon, allowing you to scale horizontally across your server fleet without architectural compromise.

SK Hynix engineered this module for the enterprise segment where reliability and consistency outweigh raw speed benchmarks. The part number HMCG78AHBRA identifies a purpose-built RDIMM (registered dual in-line memory module) with error-correcting code (ECC), the only acceptable memory type in production data centres. The module operates at 6400 MT/s—a well-proven frequency for server deployments—across the commercial temperature range of 0°C to 95°C, ensuring stable operation whether your equipment sits in a climate-controlled facility or within a cabinet experiencing thermal stress from adjacent compute. SK Hynix's reputation for DRAM validation means this DDR5-6400 variant has already been qualified against thousands of server configurations; you are not experimenting with unproven silicon.

The electrical envelope reflects mainstream enterprise design. Running at just 1.1V, the HMCG78AHBRA consumes less power than previous DDR4 generations while delivering faster bandwidth—a combination that shrinks your power distribution unit burden and reduces cooling overhead per megabyte of installed memory. Latency timings of CAS 52, tRCD 52, and tRP 52 are standard for this speed class; SK Hynix does not artificially constrain these values as they are already well-optimised for the 6400 MT/s frequency. The low-profile form factor ensures physical clearance in standard 2U and 1U chassis, even with CPU coolers that extend toward the rear of the motherboard. Storage architects and network engineers evaluating memory refresh cycles will appreciate that the PC5-51200R specification means this module plugs into any AMD EPYC 9004-series or Intel Xeon Scalable (4th and 5th generation) server without BIOS workarounds or vendor-specific firmware patches.

SK Hynix's x8 organization on the HMCG78AHBRA—referring to the data path width per rank—contributes to the low single-rank profile. A 16G die size paired with x8 architecture yields the compact 1Rx8 configuration, reducing signal propagation complexity and improving margin for high-frequency operation. This design choice is not accidental; SK Hynix deliberately positioned this module for mixed workloads where you need ECC reliability, respectable speed, and the thermal headroom to run sustained workloads without throttling. AI infrastructure teams building inference clusters often purchase the HMCG78AHBRA in bulk because the 16GB capacity aligns with batch-processing memory budgets, and the registered topology scales cleanly across node additions.

Omnixon Global stocks the SK Hynix HMCG78AHBRA for immediate shipment across our regional network in the UAE and the broader GCC, with logistics reach into Asia-Pacific and Europe. As a senior technical buyer evaluating memory for a new data-centre build or a refresh cycle, you can validate compatibility, confirm inventory depth, and request bulk pricing without navigating reseller gatekeeping. Contact us with your server manifest and deployment timeline—we handle the procurement complexity so your team can focus on configuration and validation.

Memory Performance and Architecture Specifications

• Capacity: 16GB per module; supports up to 768GB per dual-socket 2U server when fully populated
• Speed and Latency: DDR5-6400 MT/s (PC5-51200R) with CAS 52, tRCD 52, tRP 52 for predictable latency profiles across thermal ranges
• ECC Protection: Full error-correcting code with registered DIMM interface for production data-centre deployments
• Power Efficiency: 1.1V operating voltage delivers lower power draw than prior-generation DDR4, reducing thermal design power and cooling overhead
• Form Factor: Standard-height low-profile design ensures compatibility with stock server coolers and typical 1U/2U chassis configurations
• Rank Configuration: Single-rank x8 organisation minimises signal layers and improves frequency margin at 6400 MT/s and beyond
• Commercial Grade: 0°C to 95°C operating range with SK Hynix second-generation DDR5 validation across AMD EPYC 9004 and Intel Xeon Scalable 4th/5th Gen platforms