64GB DDR5-4800 RDIMM 2RX4 1.1V
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The SK hynix HMCG94AEBQA103N AA is an enterprise-grade 64GB DDR5-4800 dual-rank registered DIMM (2Rx4 RDIMM) designed for high-density server environments. Operating at 4800 MT/s with a nominal voltage of 1.1V, this module provides superior bandwidth, energy efficiency, and data integrity for demanding enterprise workloads. It is ideal for memory-intensive enterprise computing including virtualization, database indexing, and machine learning infrastructure.
The HMCG94AEBQA103N is built on SK hynix 16Gb DDR5 SDRAM A-die components configured in a dual-rank x4 (2Rx4) topology using 32 discrete DRAM packages. The DDR5 architecture introduces dual independent 40-bit subchannels (32-bit data plus 8-bit ECC) per module, doubling concurrent memory access efficiency compared to DDR4. Buffering is managed by an enterprise JEDEC-standard Registered Clock Driver (RCD), which re-drives command, address, and clock signals to reduce electrical loading on the host memory controller. The module integrates an on-board Power Management IC (PMIC) to regulate VDD, VDDQ, and VPP locally, reducing motherboard power-routing complexity and improving transient response. It also incorporates an SPD Hub with integrated thermal telemetry and features dual-layer error protection combining DRAM-level On-Die ECC with end-to-end sideband bus ECC. Decoding the part number: 'HMCG' identifies SK hynix DDR5 RDIMM, '9' indicates 64GB capacity, '4' represents a dual-rank x4 configuration, 'A' specifies 16Gb A-die DRAM revision, and 'Q' designates the DDR5-4800 speed grade (CL40).
Always verify against your server's qualified vendor list (QVL).
No, DDR5 RDIMMs are physically and electrically incompatible with DDR4 slots due to differences in key notch position, pin layout (288 pins with different pinouts), voltage specifications (1.1V vs 1.2V), and on-module PMIC architecture.
The onboard Power Management IC (PMIC) steps down 12V host input power to the exact voltages required by the DRAM dies and RCD (1.1V VDD/VDDQ, 1.8V VPP). This provides cleaner power delivery, reduced voltage droop, and better thermal monitoring directly on the module.
Yes, JEDEC-compliant DDR5-4800 RDIMMs can downclock automatically based on platform BIOS/UEFI capabilities, memory population rules (such as 2 DPC configurations), and host processor limits.
The HMCG94AEBQA103N AA is a TAA-compliant 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 10 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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