16GB DDR5-6400 RDIMM 1RX8 1.1V
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The SK hynix HMCG78AHBRA471N AA is an enterprise-grade 16GB DDR5-6400 (PC5-51200) single-rank registered DIMM designed for next-generation data center workloads. Built on SK hynix high-density A-die DRAM, it delivers up to 51.2 GB/s bandwidth at an energy-efficient 1.1V operating voltage. Ideal for high-performance computing, virtualization, and enterprise server tiers, it provides native JEDEC reliability with comprehensive dual-tier ECC protection.
The HMCG78AHBRA471N AA is built using SK hynix 16Gb A-die DDR5 SDRAM ICs arranged in a 1Rx8 (single rank, 8-bit wide) physical layout. DDR5 fundamentally redesigns server memory architecture by splitting the conventional 64-bit wide data channel into two independent 32-bit subchannels, each augmented with 8 bits of sideband ECC for a combined 80-bit interface per module. Buffering is managed by a high-speed JEDEC-compliant DDR5 Registering Clock Driver (RCD), which re-drives command and address signals to preserve signal integrity at extreme transfer rates of 6400 MT/s. The module integrates an on-board Power Management IC (PMIC) to convert 12V input directly into stabilized 1.1V VDD/VDDQ and 1.8V VPP rails, alongside a precision SPD Hub with integrated thermal sensing. Fault tolerance is reinforced through a multi-tier scheme featuring native On-Die ECC (ODECC) for internal bit correction within the DRAM die and sideband ECC for bus-level data integrity.
Decoding the SK hynix part number HMCG78AHBRA471N AA: 'HMCG' designates SK hynix DDR5 Module; '7' denotes 16GB capacity; '8' indicates x8 device organization; 'A' refers to 1st-generation 16Gb A-die silicon; 'H' specifies an RDIMM form factor; 'B' denotes the standard PCB raw card revision; 'R' specifies component packaging; 'A471N' maps to the DDR5-6400 speed bin with standard industrial temperature ratings; and 'AA' designates the manufacturing firmware/hardware stepping.
Always verify against your server's qualified vendor list (QVL).
Yes. The module conforms to JEDEC standards and will automatically downclock to 5600 MT/s or 4800 MT/s if installed in server platforms based on 4th or 5th Gen Intel Xeon Scalable or AMD EPYC 9004 processors, provided the server BIOS/firmware supports 16GB 1Rx8 DDR5 RDIMMs.
Unlike DDR4, which relies on the motherboard voltage regulator module (VRM), DDR5 integrates the PMIC directly on the DIMM. This improves power distribution efficiency, minimizes IR drop, reduces electrical noise, and allows the module to operate stably at 1.1V under high-frequency 6400 MT/s loads.
No. Registered DIMMs (RDIMMs) require dedicated memory controller RCD handshake logic and pin definitions found exclusively in enterprise server and workstation platforms. They are electrically and mechanically incompatible with client desktop platforms that require unbuffered UDIMMs.
The HMCG78AHBRA471N AA is a enterprise server memory module (16GB DDR5-6400 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 30 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.