128GB DDR5-5600 RDIMM 2RX4 1.1V
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The Samsung M321RAJA0MB2-CWMHY is an enterprise-grade 128GB DDR5-5600 dual-rank (2Rx4) Registered DIMM designed for mission-critical hyperscale and datacenter infrastructure. Engineered with monolithic 32Gb DRAM dies, it delivers high-density memory capacity and up to 44.8 GB/s bandwidth per module at a low 1.1V operating voltage. It is tailored for memory-intensive enterprise workloads including virtualization, AI training/inference, in-memory databases, and high-performance computing (HPC).
The Samsung M321RAJA0MB2-CWMHY utilizes JEDEC-standard DDR5 architecture featuring two independent 32-bit subchannels (plus 8 bits of ECC per subchannel, forming a 40-bit subchannel bus) on a single physical 288-pin module. Organized in a dual-rank (2Rx4) topology using cutting-edge 32Gb monolithic DRAM dies, this module avoids the thermal and latency penalties associated with Through-Silicon Via (3DS) stacking. A high-performance Registering Clock Driver (RCD) buffers command, address, and clock signals to reduce electrical load on the host memory controller. DDR5 introduces an onboard Power Management IC (PMIC), which accepts a 12V rail directly from the motherboard and accurately regulates localized voltages (1.1V VDD/VDDQ, 1.8V VPP), minimizing voltage drop and maximizing power efficiency.
Reliability is governed by multi-tier error correction: On-Die ECC (ODECC) addresses internal DRAM cell errors, while traditional sideband ECC corrects single-bit and detects multi-bit transmission faults across the memory bus. A JEDEC-compliant SPD Hub integrates non-volatile configuration memory with high-precision thermal sensors for real-time telemetry. In the part number M321RAJA0MB2-CWMHY, 'M321' denotes a Samsung DDR5 RDIMM form factor, 'R' identifies DDR5 technology, 'A' indicates 32Gb die density, 'J' specifies a 2Rx4 rank configuration, 'M' marks the die revision, 'WM' indicates DDR5-5600 speed binning (CL46), and 'HY' designates the specific hardware PMIC and RCD production stepping.
Always verify against your server's qualified vendor list (QVL).
This module is built using monolithic 32Gb DRAM dies in a 2Rx4 topology. Unlike older 128GB modules that required 2S2R or 4H 3DS TSV (Through-Silicon Via) stacking of 16Gb dies, this monolithic architecture lowers manufacturing complexity, improves thermal dissipation, and reduces access latencies.
Yes. The module supports JEDEC standard fallback profiles and will automatically clock down to DDR5-4800 (or other lower platform-supported speeds) if limited by server platform capabilities, processor generation, or multi-DIMM per channel (2DPC) configurations.
DDR5 integrates a Server Power Management IC (PMIC) on the module to convert a 12V system rail directly into required voltages (1.1V VDD, VDDQ, and 1.8V VPP). This reduces board-level trace complexity, minimizes power loss and voltage droop, and provides fine-grained, localized power management under burst enterprise workloads.
The M321RAJA0MB2-CWMHY is a enterprise server memory module (128GB DDR5-5600 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, with 400 more incoming.
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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