16GB DDR5-5600 RDIMM 1RX8 1.1V
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The SK hynix HMCG78AGBRA619N AA is a 16GB DDR5-5600 PC5-44800 Registered ECC DIMM (RDIMM) engineered for enterprise-tier computing and data centers. Operating at a low 1.1V nominal supply, it provides substantial bandwidth improvements and enhanced energy efficiency over previous DDR4 generations. It is optimized for enterprise platforms driven by 4th/5th Gen Intel Xeon Scalable and AMD EPYC 9004/8004 processors.
The HMCG78AGBRA619N AA utilizes SK hynix 16Gb A-die DDR5 SDRAM chips organized in a single-rank configuration (1Rx8). Designed in accordance with JEDEC DDR5 RDIMM specifications, the module features dual 32-bit independent subchannels (plus 8 bits of ECC per subchannel) to drastically improve bus efficiency. The module integrates an onboard Registering Clock Driver (RCD) to buffer command and address signals, reducing electrical loading on the host CPU memory controller. Power regulation is handled directly on the DIMM via a dedicated Power Management IC (PMIC), which steps down host input power to 1.1V VDD/VDDQ/VPP, complemented by an integrated SPD Hub with thermal sensing. Reliability is reinforced via dual-layer error management, combining DDR5 JEDEC sideband ECC for bus-level data protection with native on-die ECC (ODECC) for internal die-level bit correction. The part number decodes as: HMCG (SK hynix DDR5), 78 (16GB, 1Rx8), A (16Gb A-die), GBR (RDIMM form factor), 619 (DDR5-5600, CL46 speed grade), N (Lead-free/RoHS compliant), and AA (PCB design revision).
Always verify against your server's qualified vendor list (QVL).
Yes, the module is fully backward compatible and will automatically downclock to DDR5-4800 or other speeds supported by the processor and motherboard memory topology.
Yes, the module features on-die ECC (ODECC) within the DRAM chips to correct single-bit errors inside the die, as well as enterprise sideband ECC across the memory bus to correct transmission errors between the RDIMM and host memory controller.
Mixing x8 and x4 memory modules within the same memory channel is not supported by most enterprise server platforms and can lead to boot failure or reduced memory operational speed.
The HMCG78AGBRA619N AA is a enterprise server memory module (16GB DDR5-5600 RDIMM 1RX8 1.1V). Sold as factory-sealed OEM stock with a 1-year warranty and same-day US shipping when in stock. We stock 34 units of this SKU today.
Compatible with enterprise servers requiring this exact configuration. Bulk orders welcome — quotes typically returned within one business hour. Payment terms: NET-30 for approved accounts, or instant on-chain payment via USDC/ETH on Base or Ethereum for autonomous AI agents and Web3 buyers.
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