16GB DDR5-5600 UDIMM 1Rx8 1.1V
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The SK hynix HMCG78AGBEA081N is a 16GB DDR5-5600 unbuffered DIMM (UDIMM) engineered for entry-level workstations, edge micro-servers, and client compute systems. Operating at 5600 MT/s on a native 1.1V supply, this module provides significant memory bandwidth and improved efficiency compared to previous DDR4 generations. Designed with single-rank x8 density, it delivers dependable, high-speed memory performance for mission-critical client and embedded infrastructure.
The HMCG78AGBEA081N is built on SK hynix DDR5 DRAM architecture organized in a 1Rx8 (single rank) topology utilizing eight discrete 16Gb (2Gx8) DRAM packages. As a standard unbuffered module (UDIMM), it lacks a Registering Clock Driver (RCD) or data buffers, with command and address signals routed directly to the DRAM components. DDR5 modules split the conventional 64-bit data bus into two independent 32-bit subchannels, which enhances channel concurrency and memory access efficiency.
Power regulation is decoupled from the motherboard and managed directly on the module via a dedicated Power Management IC (PMIC), which steps down a 5V input to 1.1V (VDD/VDDQ) and 1.8V (VPP). An integrated SPD Hub contains the serial presence detect EEPROM and embedded thermal sensor. While the module features internal on-die ECC (ODECC) for managing cellular bit error rates inside the DRAM die, it does not include extra sideband bits for system-level ECC bus correction. Part number decoding indicates: HM (SK hynix Memory), C (DDR5 SDRAM), G7 (16GB 1Rx8 density/organization), 8 (UDIMM form factor), A (die revision), and GB (DDR5-5600B timing specification, standard CL46).
Always verify against your server's qualified vendor list (QVL).
This module features on-die ECC (ODECC), which is native to all DDR5 memory for internal DRAM cell reliability. However, it is an unbuffered non-ECC module (UDIMM) and lacks the additional 8-bit bus parity required for end-to-end sideband ECC support.
No. UDIMMs and RDIMMs (Registered DIMMs) utilize different signal architectures and pin layouts. They are electrically and architecturally incompatible and cannot be mixed or installed in RDIMM-only server sockets.
Unlike DDR4, where motherboard VRMs regulate DRAM voltage, DDR5 shifts power management to the DIMM via an onboard PMIC. It receives a 5V input from the board and precisely regulates 1.1V VDD/VDDQ and 1.8V VPP directly on the module, reducing noise and power loss.
The HMCG78AGBEA081N AA is a TAA-compliant enterprise server memory module (16GB DDR5-5600 UDIMM 1Rx8 1.1V). Sold as factory-sealed OEM stock with a 1-year warranty and same-day US shipping when in stock. We stock 3 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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