64GB DDR5-6400 RDIMM 2RX4 1.1V
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The SK hynix HMCG94CHBRA280N AA is a high-performance 64GB DDR5-6400 PC5-51200 dual-rank registered DIMM (RDIMM) engineered for enterprise server deployments. Operating at a nominal 1.1V, this 2Rx4 module delivers substantial bandwidth and memory density for bandwidth-intensive data center workloads, virtualization, and AI inference. Built on advanced SK hynix DRAM silicon, it integrates an onboard PMIC, SPD hub, and comprehensive ECC support to maximize system uptime and signal integrity.
The HMCG94CHBRA280N AA utilizes a dual-rank x4 (2Rx4) layout populated with 16Gb monolithic DDR5 SDRAM dies. The DDR5 architecture splits the standard 64-bit data bus into two independent 32-bit subchannels (each accompanied by 8 bits of ECC metadata for a 40-bit channel width), doubling burst length to BL16 and substantially improving bus efficiency. An onboard Registering Clock Driver (RCD) re-drives command, address, and clock signals to alleviate electrical loading on the host memory controller. Power distribution is managed directly on the PCB via a 12V-to-1.1V Power Management IC (PMIC), ensuring tight voltage rail regulation (VDD/VDDQ/VPP) and lower I2R motherboard trace losses compared to legacy DDR4 architectures.
Reliability is governed through a multi-tiered error management schema combining DRAM-level On-Die ECC (ODECC) for internal cell refresh/read correction with traditional sideband bus-level ECC handled by the host CPU memory controller. The part number decodes according to SK hynix enterprise convention: 'HMCG' designates SK hynix DDR5 RDIMM server memory, '9' specifies 64GB module density, '4' signifies a 2Rx4 rank and chip width organization, followed by die generation and package codes ('CHBR'), RCD/speed revision ('A280N' denoting DDR5-6400 JEDEC binning), and assembly revision 'AA'. The module also integrates an SPD Hub with embedded thermal sensors to provide real-time thermal telemetry over the I3C/I2C bus.
Always verify against your server's qualified vendor list (QVL).
Yes. The module is backward-compatible and will clock down to the maximum data rate supported by the host CPU memory controller and motherboard BIOS (e.g., 4800 MT/s or 5600 MT/s) via standard SPD JEDEC profiles.
A 2Rx4 dual-rank RDIMM provides an optimal balance between capacity and performance; however, running at native 6400 MT/s typically requires a 1 DIMM per channel (1DPC) configuration depending on the server CPU specification. Populating 2 DIMMs per channel (2DPC) may cause the system to downclock memory speed.
DDR5 moves power regulation from the server motherboard directly to the DIMM via an onboard Power Management IC (PMIC). The PMIC receives 12V input from the mainboard and regulates VDD, VDDQ (1.1V), and VPP (1.8V) locally, providing cleaner power delivery, improved noise margins, and programmable voltage control.
The HMCG94CHBRA280N AA is a TAA-compliant enterprise server memory module (64GB DDR5-6400 RDIMM 2RX4 1.1V). Sold as NEW 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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