64GB DDR5-4800 RDIMM 2RX4 1.1V
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The SK hynix HMCG94MEBRA123N AA is a high-density 64GB DDR5-4800 dual-rank registered ECC memory module (RDIMM) designed for enterprise data centers and mission-critical server environments. Operating at a nominal 1.1V with a data transfer rate of 4800 MT/s, it delivers significant bandwidth and efficiency improvements over DDR4 infrastructure. Engineered for reliability, it features onboard power management, dual 32-bit subchannels, and comprehensive error-correcting code protection.
The HMCG94MEBRA123N module is built on SK hynix DDR5 DRAM architecture utilizing 16Gb monolithic dies configured in a dual-rank x4 (2Rx4) layout. DDR5 splits the traditional 64-bit channel into two independent 32-bit data subchannels, each supported by an 8-bit ECC overhead (40-bit wide per subchannel), vastly improving channel efficiency and memory access concurrency. Signal synchronization and command buffering are handled by a dedicated DDR5 Registering Clock Driver (RCD), reducing capacitive loading on the host memory controller.
Power regulation is shifted from the motherboard to the DIMM via an onboard Power Management IC (PMIC), which accepts a 12V rail and regulates down to 1.1V VDD/VDDQ and 1.8V VPP with tighter voltage margins. The module integrates an SPD Hub with embedded temperature sensors connected via I3C/I2C sideband buses. In addition to conventional sideband ECC handling multi-bit detection and single-bit correction across the bus, the DRAM dies include native on-die ECC (ODECC) to correct internal bit flips within the memory array. In the part number, 'HMCG' denotes SK hynix DDR5 RDIMM, '9' indicates 64GB density, '4' represents a 2Rx4 rank and chip width organization, and 'EB' denotes the DDR5-4800 speed bin.
Always verify against your server's qualified vendor list (QVL).
No. DDR5 RDIMMs utilize an entirely different pin layout, key notch location, signaling topology, and 1.1V power delivery compared to 1.2V DDR4 modules, making them physically and electrically incompatible.
The Power Management IC (PMIC) resides directly on the RDIMM PCB rather than on the motherboard, converting a host 12V supply to the module's operating voltages. This allows for tighter power regulation, reduced signal noise, and lower overall power draw.
On-die ECC mitigates bit errors internally within the 16Gb DRAM cells to maintain cell reliability at high densities, whereas the module-level sideband ECC operates across the memory bus to detect and correct data errors during transfer between the memory module and the host CPU.
The HMCG94MEBRA123N AA 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 100 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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