16GB DDR5-5600 RDIMM 1RX8 1.1V
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The SK hynix HMCG78AGBRA619N BB is a 16GB DDR5-5600 PC5-44800 CL46 single-rank (1Rx8) registered ECC memory module designed for enterprise server infrastructure. Operating at a low 1.1V nominal supply, it provides high memory bandwidth, improved channel efficiency, and reliable error detection for modern data center workloads.
The HMCG78AGBRA619N BB is built on SK hynix 16Gb A-die DDR5 DRAM components organized in a single-rank 1Rx8 configuration across dual independent 32-bit sub-channels (plus 8 bits of sideband ECC per sub-channel, totaling 80 bits per module). The module incorporates an on-board Registering Clock Driver (RCD) to buffer command and address signals, reducing the capacitive loading on the server's memory bus. Reliability is reinforced via on-die ECC (ODECC) within the DRAM ICs alongside system-level sideband ECC handled by the memory controller.
Following JEDEC DDR5 specifications, power regulation is shifted from the motherboard to the module itself via an onboard Power Management IC (PMIC), which efficiently converts incoming 12V server power to 1.1V VDD/VDDQ and 1.8V VPP. A combined SPD Hub with integrated thermal telemetry facilitates precise temperature monitoring over an I3C/I2C serial bus. In the SK hynix part numbering, 'HMCG' designates SK hynix DDR5 module family, '7' specifies 16GB capacity, '8' indicates 1Rx8 configuration, 'A' indicates 16Gb A-die, 'R' indicates RDIMM form factor, and '619N' maps to the DDR5-5600 CL46 JEDEC timing envelope.
Always verify against your server's qualified vendor list (QVL).
Yes. The module supports automatic downclocking to DDR5-4800 or other lower speeds via standard JEDEC SPD profiles, provided the motherboard and processor support registered DDR5 (RDIMM) memory.
While most server memory controllers permit mixing ranks across different channels, mixing x8 and x4 organization or different rank layouts within the same memory channel is generally unsupported or not recommended as it disables balanced multi-channel performance optimizations.
The PMIC (Power Management Integrated Circuit) takes a 12V input directly from the motherboard and locally steps it down to the DRAM operating voltages (1.1V VDD/VDDQ and 1.8V VPP). This provides tighter voltage regulation, lower noise, and improved power efficiency compared to motherboard-regulated DDR4 architecture.
The HMCG78AGBRA619N BB 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 125 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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