16GB DDR5-5600 UDIMM 1Rx8 1.1V
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The SK hynix HMCG78AGBEA081N BA is a 16GB DDR5-5600 PC5-44800 single-rank (1Rx8) ECC Unbuffered DIMM (ECC UDIMM) engineered for enterprise-grade stability and entry-level server and workstation performance. Operating at a low 1.1V nominal voltage, this module delivers up to 44.8 GB/s bandwidth, meeting demanding compute requirements. It provides dual-layer data integrity by combining DDR5 native on-die ECC with traditional sideband ECC for mission-critical reliability.
The HMCG78AGBEA081N BA is built on SK hynix's 16Gb A-die DRAM generation using a 1Rx8 (single rank, 8-bit wide DRAM devices) layout. In DDR5 ECC UDIMM architecture, the standard 64-bit channel is split into two independent 32-bit subchannels, each augmented with an 8-bit sideband for ECC (yielding two 40-bit subchannels). This internal channelization substantially improves memory access concurrency, bus efficiency, and reduces access latency compared to DDR4. As an unbuffered module, it lacks an RCD (Registering Clock Driver) or data buffers, communicating directly with the host memory controller.
Power regulation is shifted from the motherboard onto the module via an onboard Power Management IC (PMIC) and an integrated SPD Hub with thermal sensing, stabilizing the 1.1V VDD/VDDQ and 1.8V VPP rails under heavy transactional loads. Decoding the SK hynix part number: 'HMCG' designates SK hynix DDR5 ECC UDIMM; '78' identifies the 288-pin ECC UDIMM form factor and 16GB single-rank configuration; 'A' denotes the DRAM die revision (A-die); 'GB' specifies the x8 package organization; 'E' indicates DDR5-5600 speed binning (JEDEC CL46 standard); and 'A081N' / 'BA' tracks the circuit raw card revision, packaging type, and lead-free/halogen-free manufacturing step.
Always verify against your server's qualified vendor list (QVL).
No. ECC UDIMMs (unbuffered) and RDIMMs (registered) use fundamentally different electrical signaling and pin assignments. Motherboards and memory controllers support either RDIMMs or UDIMMs, and mixing them is not supported.
On-Die ECC is a standard internal feature of all DDR5 DRAM chips that detects and corrects bit flips inside the memory array. This ECC UDIMM adds an extra DRAM device to provide full sideband ECC, allowing the system memory controller to detect and correct transmission errors occurring over the bus between the CPU and memory.
No. Unlike DDR4, DDR5 modules handle their own voltage stepping via an on-module Power Management IC (PMIC). The motherboard supplies 5V or 12V to the PMIC, which manages precise 1.1V VDD, 1.1V VDDQ, and 1.8V VPP delivery directly on the module PCB.
The HMCG78AGBEA081N BA 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 60 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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