16GB DDR5-6400 RDIMM 1RX8 1.1V
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The SK hynix HMCG78AHBRA478N BB is a high-performance 16GB DDR5-6400 (PC5-51200) single-rank (1Rx8) Registered DIMM designed for enterprise servers and data centers. Operating at an efficient 1.1V, this RDIMM provides high memory bandwidth, robust signal integrity, and high reliability for memory-intensive enterprise computing workloads.
The HMCG78AHBRA478N BB is architected around SK hynix's 16Gb A-die DDR5 DRAM components organized in a single-rank 1Rx8 configuration. DDR5 splits the traditional 64-bit data bus into two independent 32-bit subchannels (each with an additional 8-bit sideband for ECC, yielding two 40-bit channels per DIMM). This split-channel architecture doubles the effective burst length and improves memory access efficiency. The module integrates a JEDEC-standard Registering Clock Driver (RCD) to re-drive command, address, and clock signals, reducing capacitive loading on the server's memory controller.
In accordance with JEDEC DDR5 specifications, power regulation is moved directly onto the module via an onboard Power Management IC (PMIC), which converts a 12V supply down to the required 1.1V (VDD/VDDQ/VPP) rails for tighter voltage tolerance and lower host board complexity. Thermal and operational telemetry are managed by an integrated SPD Hub with thermal sensors. Reliability is reinforced via a combination of silicon-level On-Die ECC (ODECC) for internal bit-flip correction and system-level sideband ECC across the bus. In the SK hynix nomenclature, 'HMCG' denotes DDR5 RDIMM, '7' designates 16GB capacity, '8' indicates a 1Rx8 layout, 'A' indicates A-die revision, and 'BB' indicates module stepping.
Always verify against your server's qualified vendor list (QVL).
Yes, DDR5-6400 RDIMMs are backward compatible and will automatically downclock to the maximum transfer speed supported by the host CPU and motherboard UEFI, provided the platform accepts 16GB 1Rx8 DDR5 RDIMMs.
A 1Rx8 configuration uses eight 16Gb x8 memory chips (plus ECC devices) in a single electrical rank. Single-rank modules place lower electrical load on the memory bus compared to dual-rank modules, making them optimal for configurations running at maximum JEDEC speeds like 6400 MT/s.
DDR5 RDIMMs incorporate an onboard Power Management IC (PMIC) to locally regulate 1.1V operational voltages from a 12V input, providing tighter voltage regulation, reduced power loss, and localized power management independent of the motherboard.
The HMCG78AHBRA478N BB 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 5 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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