64GB DDR5-4800 RDIMM 2RX4 1.1V
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The SK hynix HMCG94AEBRA123N AA is an enterprise-grade 64GB DDR5-4800 (PC5-38400) Registered DIMM engineered for demanding data center and server environments. Featuring a dual-rank x4 (2Rx4) layout built on SK hynix 16Gb A-die silicon, it delivers high memory throughput and lower latency at a standard operating voltage of 1.1V. This module integrates an onboard PMIC and dual independent 40-bit subchannels, providing significant bandwidth and reliability improvements over DDR4 infrastructure.
The HMCG94AEBRA123N AA module is architectured around JEDEC DDR5 standards, utilizing SK hynix 16Gb A-die DRAM ICs configured in a dual-rank, x4 organization (2Rx4). The DDR5 standard splits the conventional 64-bit data bus into two independent 32-bit subchannels (each with 8 additional bits for sideband ECC, totaling 40 bits per subchannel), effectively doubling burst length from BL8 to BL16 and drastically increasing bus utilization efficiency. A central Registering Clock Driver (RCD) buffers command, address, and clock signals to maintain signal integrity across dense multi-DIMM channel configurations.
Power regulation has moved from the motherboard directly onto the module via an onboard Power Management IC (PMIC), which accepts a 12V input rail and tightly steps it down to 1.1V (VDD/VDDQ/VPP) to minimize power loss and noise. An integrated SPD Hub contains the serial presence detect EEPROM and a thermal sensor operating via high-speed I3C/I2C sideband buses. Reliability is fortified by combining internal DRAM on-die ECC (ODECC) for single-bit silicon fault recovery with system-level sideband ECC across the subchannels. In the part number string, 'HMCG' designates an SK hynix DDR5 module, '9' denotes 64GB density, '4' signifies a 2Rx4 rank organization, 'A' identifies the first DRAM silicon revision (A-die), 'EB' specifies DDR5-4800 (CL40) timing binning, and 'R' confirms the RDIMM form factor.
Always verify against your server's qualified vendor list (QVL).
No. DDR5 RDIMMs utilize an entirely different electrical, physical, and signal architecture compared to DDR4. The mechanical alignment notch is positioned differently, preventing physical insertion, and DDR5 requires motherboard support for onboard PMICs.
On-die ECC (ODECC) corrects single-bit errors inside the DRAM silicon to improve manufacturing yields and cell reliability, but it does not protect data in flight. This module also incorporates dedicated parity and sideband ECC across its two 40-bit subchannels to protect against data transmission errors between the memory controller and the DRAM.
Yes. Memory controllers and system BIOS negotiate supported JEDEC timing parameters from the module's SPD Hub. If the processor or memory population rules restrict frequency to DDR5-4400, this module will safely operate at the lower speed.
The HMCG94AEBRA123N 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 7 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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