64GB DDR5-6400 RDIMM 2RX4 1.1V
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The SK hynix HMCG94CHBRA403N AA is an enterprise-grade 64GB DDR5-6400 Registered DIMM (RDIMM) engineered for next-generation data center and high-performance server architectures. Operating at a nominal 1.1V with a 2Rx4 topology, this dual-rank module achieves a peak theoretical bandwidth of 51.2 GB/s per channel. It integrates hardware-level reliability features including an on-module Power Management IC (PMIC), an SPD Hub with integrated thermal sensors, and dual-layer ECC protection.
The HMCG94CHBRA403N AA is built on SK hynix DDR5 DRAM technology utilizing high-density 16Gb monolithic dies configured in a dual-rank x4 (2Rx4) layout across dual independent 40-bit subchannels (32 data bits plus 8 ECC bits each). A dedicated Register Clock Driver (RCD) buffers command, address, and clock signals to alleviate electrical loading on the host memory controller. DDR5 architecture shifts core power conversion from the motherboard directly onto the module via an integrated 1.1V Power Management IC (PMIC), resulting in tighter voltage regulation, lower power distribution loss, and improved signal integrity at high transfer rates. Robust data integrity is enforced via on-die ECC (ODECC) for internal silicon-level bit flip mitigation, paired with side-band ECC managed by the host memory controller to protect data in flight.
The SK hynix alphanumeric part number decodes systematically: 'HMCG' designates SK hynix DDR5 RDIMM server memory; '94' represents the 64GB capacity structured as a dual-rank x4 configuration; 'C' indicates the DRAM die generation; 'H' and 'B' denote the 1.1V VDD/VDDQ/VPP power profile and halogen-free BGA packaging; 'R' specifies the Registered DIMM form factor; 'A4' signifies the JEDEC DDR5-6400 timing bin (CL52); and '03N AA' references the specific module BOM revision, RCD stepping, and production release code.
Always verify against your server's qualified vendor list (QVL).
Yes. The module includes standard JEDEC SPD fallback profiles and will automatically downclock to 5600 MT/s or 4800 MT/s to match the maximum memory frequency supported by the processor and motherboard topology.
No. DDR5 RDIMMs are physically and electrically incompatible with standard desktop unbuffered DIMM slots, DDR4 server sockets, and standard SODIMM slots due to distinct 288-pin mechanical keying, dual 40-bit subchannel routing, and on-module PMIC power delivery.
DDR5 introduces dual independent 40-bit subchannels per DIMM for improved channel utilization, an onboard PMIC for stable local voltage regulation, integrated temperature telemetry within the SPD hub, and on-die ECC combined with end-to-end bus parity to safeguard against bit errors.
The HMCG94CHBRA403N 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 53 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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