64GB DDR5-4800 RDIMM 2RX4 1.1V
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The SK hynix HMCG94MEBRA109N is an enterprise-class 64GB DDR5-4800 (PC5-38400) Registered DIMM designed for high-density, mission-critical server environments. Operating at a low 1.1V standard supply, this dual-rank x4 module provides substantial bandwidth enhancements and energy efficiency for compute-intensive virtualization, database, and cloud workloads. Engineered with an onboard Power Management IC (PMIC) and robust error correction, it ensures maximum platform stability and signal integrity.
The HMCG94MEBRA109N is built on SK hynix's 16Gb DDR5 SDRAM die architecture configured in a dual-rank 2Rx4 topology (utilizing 32 discrete 16Gb x4 DRAM packages). Unlike DDR4's single 72-bit bus, DDR5 divides the 288-pin RDIMM interface into two independent 36-bit subchannels (32-bit data plus 4-bit ECC each), doubling subchannel concurrency and improving memory bus efficiency. The module integrates an advanced Register Clock Driver (RCD) to re-drive command, address, and clock signals to minimize host controller capacitive loading.
Power regulation is shifted from the motherboard directly onto the module via an enterprise On-DIMM Power Management IC (PMIC), receiving a 12V input rail and converting it to 1.1V VDD, VDDQ, and 1.8V VPP with precise localized voltage regulation. An integrated SPD Hub combines serial presence detect EEPROM with high-precision thermal sensors. Reliability is fortified through dual-layer error management: On-Die ECC (ODECC) resolves internal cell-level bit flips within each DRAM component, while traditional sideband parity/ECC managed through the server memory controller corrects channel transmission errors. Decoded, 'HMCG' designates SK hynix DDR5 server module, '9' represents 64GB capacity, '4' signifies a 288-pin RDIMM, 'M' denotes x4 component organization, and '109' aligns with the JEDEC DDR5-4800B (CL40-39-39) speed bin.
Always verify against your server's qualified vendor list (QVL).
No. DDR5 RDIMMs feature a completely different 288-pin mechanical notch alignment, run on an integrated 12V-to-1.1V PMIC architecture, and use two independent 32-bit subchannels, making them electrically and mechanically incompatible with DDR4 slots.
The onboard Power Management IC (PMIC) steps down a 12V input from the motherboard to the module's operating voltages (1.1V VDD/VDDQ and 1.8V VPP). This provides tighter voltage regulation, reduced host motherboard routing complexity, and lower overall system power noise compared to previous DDR generations.
A single DDR5 RDIMM architecture natively contains two independent 32-bit data (plus 8-bit ECC) subchannels. While two physical modules are still required to populate traditional dual-channel CPU memory topologies, each individual module operates internally with split subchannel concurrency to dramatically improve execution efficiency.
The HMCG94MEBRA109N 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 12 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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