16GB DDR5-6400 RDIMM 1RX8 1.1V
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The SK hynix HMCG78AHBRA478N AA is an enterprise-grade 16GB DDR5-6400 (PC5-51200) single-rank registered DIMM engineered for high-bandwidth server workloads. Operating at an energy-efficient 1.1V, this 1Rx8 RDIMM delivers robust throughput, high signal integrity, and comprehensive reliability for modern multi-core data center environments.
The HMCG78AHBRA478N AA is built on SK hynix's 16Gb A-die DDR5 DRAM technology configured in a single-rank x8 layout (1Rx8). Across two independent 40-bit subchannels (32 data bits plus 8 sideband ECC bits each), the module features an onboard Registering Clock Driver (RCD) to re-drive command, address, and clock signals, minimizing electrical loading on the host memory controller. Power delivery is managed directly on the module via a dedicated Power Management IC (PMIC) at 1.1V nominal VDD/VDDQ/VPP, which is monitored alongside module thermals through the onboard SPD Hub.
Decoded, the part number denotes SK hynix enterprise DDR5 RDIMM architecture ('HMCG'), 16GB capacity in a 1Rx8 structure ('78'), A-die revision ('A'), DDR5-6400 JEDEC speed tier ('HB'), registered form factor ('R'), and specific PCB design revision ('A478N'). Error mitigation is multi-tiered, combining DRAM-level On-Die ECC (ODECC) for internal bit flips with traditional sideband ECC for end-to-end data transmission protection across the memory bus.
Always verify against your server's qualified vendor list (QVL).
Yes, DDR5 RDIMMs are backward compatible and will automatically downclock to the maximum transfer speed supported by the host processor and platform BIOS.
Unlike DDR4, DDR5 moves power regulation from the motherboard directly onto the module via a Power Management IC (PMIC), providing precise 1.1V voltage control, improved noise immunity, and enhanced power efficiency.
While mixing ranks and densities may boot on certain platforms, it is not recommended as it forces the memory controller to downclock or alter timings, which can degrade stability and overall memory throughput.
The HMCG78AHBRA478N AA is a TAA-compliant 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 11 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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