64GB DDR5-4800 RDIMM 2Rx4 1.1V
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The SK hynix HMCG94AEBRA109N AA is a 64GB DDR5-4800 dual-rank registered DIMM (RDIMM) engineered for enterprise server deployments. Operating at 1.1V with PC5-38400 bandwidth, this module delivers robust memory performance, advanced power efficiency, and hardware reliability for data centers, cloud infrastructure, and enterprise virtualization.
The HMCG94AEBRA109N AA is built on DDR5 SDRAM architecture utilizing 16Gb monolithic DRAM dies arranged in a 2Rx4 (dual rank, x4 bit width) organization across 288 pins. DDR5 split-channel architecture divides the conventional 64-bit data bus into two independent 32-bit subchannels (plus 8 bits of ECC each), substantially increasing command execution efficiency and memory concurrency. The module incorporates an onboard Register Clock Driver (RCD) to re-drive command and address signals, an integrated Power Management IC (PMIC) stepping down server power directly on the DIMM to 1.1V for superior voltage stability, and an SPD Hub with integrated thermal sensors. Reliability is fortified by both native on-die ECC handling transient bit-flips inside the DRAM core and sideband module-level ECC supporting multi-bit error detection and single-bit correction at the memory controller level.
Decoding the SK hynix part number HMCG94AEBRA109N: 'HMCG' designates SK hynix DDR5 Registered DIMM; '9' indicates 288-pin RDIMM form factor; '4' identifies 64GB module density; 'AE' denotes 16Gb die density with dual-rank x4 configuration (2Rx4); 'B' indicates die generation (B-die); 'R' denotes the RCD manufacturer/revision; 'A109' signifies DDR5-4800 (PC5-38400) timing specifications with CAS latency CL40; and 'N' indicates lead-free/halogen-free compliance, with 'AA' denoting the PCB/revision stepping.
Always verify against your server's qualified vendor list (QVL).
No. DDR5 memory modules have a distinct mechanical key notch, pin layout (288 pins with different pin assignments), and voltage architecture (1.1V with onboard PMIC), making them physically and electrically incompatible with DDR4 motherboard slots.
Unlike DDR4 modules which depend on motherboard-level voltage regulation, DDR5 RDIMMs include an onboard Power Management Integrated Circuit (PMIC). The PMIC converts the 12V input directly on the module down to the nominal 1.1V operational level, minimizing power loss, reducing cross-talk, and improving signal integrity.
This module will operate at up to DDR5-4800. If installed in platforms limited to lower base speeds, it will downclock to match the system's negotiated speed. However, it cannot exceed DDR5-4800 specification limits if deployed in higher-frequency platforms (e.g., DDR5-5600) without running outside JEDEC-rated parameters.
The HMCG94AEBRA109N 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 13 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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