64GB DDR5-4800 RDIMM 2RX4 1.1V
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The SK hynix HMCG94AEBRA123N is an enterprise-grade 64GB DDR5-4800 registered dual-rank (2Rx4) memory module engineered for demanding server environments. Operating at a native 1.1V, it delivers high-bandwidth throughput with optimized power efficiency for mission-critical cloud, virtualization, and HPC workloads.
The HMCG94AEBRA123N is built on SK hynix 16Gb DDR5 A-die DRAM components organized in a 2Rx4 (dual-rank, x4 data width) topology across dual 40-bit independent subchannels (32-bit data plus 8-bit ECC). Buffering is handled by an onboard JEDEC-standard Registering Clock Driver (RCD), which stabilizes address and command signals across the bus. Power regulation is transferred from the motherboard directly onto the module via an integrated 1.1V Power Management IC (PMIC), accompanied by an SPD Hub with integrated thermal sensing to ensure fine-grained telemetry and voltage precision.
Reliability is governed by multi-tier error handling combining DRAM on-die ECC (ODECC) for internal bit flips and classic sideband ECC checked by the host memory controller for transmission anomalies. Decoding the part number: 'HMCG' denotes SK hynix DDR5 Registered DIMM; '9' designates RDIMM form factor; '4' reflects 288-pin layout; 'A' corresponds to 16Gb die density; 'E' indicates x4 package width; 'B' represents 2-rank architecture; 'R' denotes component stepping; 'A1' specifies DDR5-4800 timing bin (CL40); and '23N BB' represents manufacturing revision and lead-free packaging.
Always verify against your server's qualified vendor list (QVL).
No. DDR5 RDIMMs have a different physical keying, 288-pin layout, 1.1V operating voltage, and onboard PMIC architecture, making them mechanically and electrically incompatible with DDR4 slots.
This module features both: On-Die ECC (ODECC) manages bit errors inside the 16Gb memory chips to boost component reliability, while module-level sideband ECC enables the server CPU to detect and correct data corruption occurring across the memory bus.
The onboard Power Management IC (PMIC) accepts input power from the motherboard and directly regulates operating voltages (VDD, VDDQ, VPP) on the DIMM, offering cleaner power delivery, reduced noise, and better efficiency compared to prior DDR4 architectures.
The HMCG94AEBRA123N BB is a enterprise server memory module (64GB DDR5-4800 RDIMM 2RX4 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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