64GB DDR5-8000 RDIMM 2RX4 1.1V
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The SK hynix HMCG94CMBRA772N AA is an enterprise-grade 64GB DDR5-8000 (PC5-64000) dual-rank (2Rx4) Registered DIMM engineered for demanding data center and high-performance computing workloads. Operating at an ultra-low standard supply voltage of 1.1V, this module delivers massive memory bandwidth and low latency for next-generation server architectures. It features an integrated Power Management IC (PMIC), dual 32-bit subchannels, and end-to-end ECC reliability.
The HMCG94CMBRA772N utilizes SK hynix DDR5 SDRAM architecture structured in a dual-rank, x4 organization (2Rx4) built on monolithic 16Gb DRAM dies. DDR5 splits the traditional 64-bit data bus into two independent 32-bit subchannels (each with an additional 8 bits allocated for sideband ECC), significantly improving channel concurrency and memory access efficiency. The module integrates an advanced Registering Clock Driver (RCD) to re-drive command and address signals across the memory bus, alongside an on-module Power Management IC (PMIC) that converts 12V system host power to 1.1V VDD/VDDQ, reducing motherboard power delivery complexity and noise.
Decoded from the SK hynix part number, 'HM' designates SK hynix Memory, 'C' specifies DDR5 generation, 'G9' denotes 64GB 2Rx4 density, '4' signifies standard RDIMM form factor, 'C' points to the DRAM die revision, and 'A7' marks the ultra-high DDR5-8000 speed bin. Reliability is bolstered via two tiers of error correction: internal On-Die ECC (ODECC) for single-bit flips within the memory cells and sideband multi-bit ECC processed by the system memory controller via the SPD Hub/TS sensor assembly.
Always verify against your server's qualified vendor list (QVL).
Yes, the module supports standard JEDEC SPD fallbacks and will automatically downclock to match the maximum memory speed supported by the host CPU and memory population rules.
No. Unlike DDR4, DDR5 RDIMMs utilize an onboard PMIC that takes a 12V input from the motherboard edge connector and regulates it down to 1.1V VDD, VDDQ, and 1.8V VPP directly on the module.
It features complete enterprise-grade data integrity including internal On-Die ECC (ODECC) within the DRAM chips to repair silicon-level cell errors, alongside standard bus-level ECC managed by the host processor.
The HMCG94CMBRA772N AA is a TAA-compliant enterprise server memory module (64GB DDR5-8000 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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