64GB DDR5-4800 RDIMM 2RX4 1.1V
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The SK hynix HMCG94AEBRA109N BB is a 64GB DDR5-4800 dual-rank (2Rx4) registered ECC DIMM engineered for enterprise servers and high-density datacenter computing. Operating at an energy-efficient nominal 1.1V, this module provides up to 38.4 GB/s of peak memory bandwidth per channel while delivering high reliability through advanced error correction and on-DIMM power regulation. It is optimized for 4th/5th Gen Intel Xeon Scalable and AMD EPYC 9004 series enterprise platforms.
The HMCG94AEBRA109N BB is built on SK hynix 16Gb A-die DDR5 DRAM components organized in a dual-rank 2Rx4 topology, utilizing 36 DRAM chips (18 per rank) to provide 64GB of addressable capacity with dedicated sideband parity. Unlike DDR4's single 72-bit bus, DDR5 splits the memory interface into two independent 32-bit data channels with an additional 8 bits of ECC per subchannel (two 40-bit subchannels per module). The module incorporates an on-board Registering Clock Driver (RCD) to re-drive command, address, and clock signals, significantly mitigating electrical bus loading on the host memory controller.
DDR5 shifts power conversion from the motherboard directly to the DIMM via an integrated Power Management IC (PMIC), which ingests a 12V host supply and strictly regulates VDD, VDDQ (1.1V), and VPP (1.8V) rails. Thermal and configuration monitoring is handled by a dedicated SPD Hub with integrated thermal sensors. Reliability is reinforced via a two-tier error management approach combining DRAM on-die ECC (ODECC) for internal bit error remediation and host-level ECC across each subchannel to detect and correct single-bit and multi-bit transfer anomalies. Part number breakdown: H (SK hynix), M (Module), C (DDR5), G9 (64GB density), 4 (RDIMM form factor), A (A-die revision), E/B (2Rx4 configuration), 109 (DDR5-4800B, CL40), N (RoHS/Halogen-Free), and BB (production revision).
Always verify against your server's qualified vendor list (QVL).
No. DDR5 RDIMMs feature an incompatible physical keying notch, 1.1V architecture, and onboard PMIC design that cannot interface with DDR4 slots. Additionally, registered RDIMMs cannot be mixed with unbuffered UDIMMs or non-ECC desktop modules on any enterprise platform.
The Power Management IC (PMIC) migrates core voltage regulation from the server motherboard directly to the module itself. It converts 12V host rail power into 1.1V VDD/VDDQ and 1.8V VPP, yielding tighter voltage tolerances, reduced line impedance, lower overall power noise, and better signal integrity at high DDR5 transfer rates.
Yes. The JEDEC SPD profiles programmed onto the onboard SPD Hub allow the module to automatically scale down to lower operational frequencies (such as DDR5-4400 or DDR5-4000) when constrained by specific multi-DIMM per channel (2DPC) configurations or CPU speed limitations.
The HMCG94AEBRA109N BB 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 57 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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