128GB DDR5-6400 RDIMM 2RX4 1.1V
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The Samsung M321RAJA0MB2-CCP is an enterprise-grade 128GB DDR5-6400 (PC5-51200) Registered DIMM designed for high-density, mission-critical server environments. Built with monolithic 32Gb DRAM dies in a dual-rank x4 (2Rx4) configuration, this module delivers maximum bandwidth and capacity without the thermal and latency penalties of 3DS stacking. Operating at an energy-efficient 1.1V, it is optimized for high-performance computing, virtualization, and AI inference workloads on modern enterprise server platforms.
The M321RAJA0MB2-CCP is based on Samsung's DDR5 architecture utilizing monolithic 32Gb M-die silicon fabricated on an advanced 12nm-class node. In a 2Rx4 rank layout, the module populates DRAM packages organized into dual physical ranks with a 4-bit wide data bus per device. This eliminates the need for Through-Silicon Via (3DS) stacking previously required for 128GB capacities, resulting in lower power draw, superior signal integrity, and reduced thermal generation. The part number decodes as M321 (Samsung standard DDR5 RDIMM), R (RDIMM form factor), A (depth specification), J (32Gb monolithic die density), 0 (2Rx4 organization), M (M-die revision), and CCP (DDR5-6400 with JEDEC CL52 timing at 1.1V).
Architecturally, DDR5 RDIMMs split the 64-bit main memory bus into two independent 32-bit subchannels, each augmented with 8 bits of sideband ECC for a total bus width of 80 bits. Module-level control and buffering are handled by an onboard Registering Clock Driver (RCD), which registers command, address, and clock signals to alleviate host memory controller load. Power regulation is localized via an on-module Power Management IC (PMIC) that steps down 12V motherboard input to 1.1V VDD/VDDQ and 1.8V VPP. Complete error recovery is supported through a combination of internal on-die ECC (ODECC) for bit-flip correction within the DRAM cells and system-level sideband ECC across the bus, managed alongside an SPD Hub featuring integrated thermal telemetry.
Always verify against your server's qualified vendor list (QVL).
No. The M321RAJA0MB2-CCP utilizes native monolithic 32Gb DRAM dies (Samsung M-die) in a planar 2Rx4 topology, eliminating the need for 3DS Through-Silicon Via stacking. This design reduces thermal output, power dissipation, and access latency compared to stacked 128GB 3DS modules.
Yes. The module supports JEDEC standard backward compatibility. When installed in host platforms rated for DDR5-5600 or DDR5-4800, the SPD Hub automatically down-clocks the module to match the memory controller's supported maximum frequency and timings.
Unlike DDR4, which relies on motherboard-based voltage regulators, this DDR5 RDIMM integrates an onboard Power Management IC (PMIC). The PMIC receives a single 12V input from the system board and locally generates the required 1.1V VDD/VDDQ and 1.8V VPP rails, resulting in superior power efficiency, transient response, and noise isolation.
The M321RAJA0MB2-CCP is a enterprise server memory module (128GB DDR5-6400 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 0 units of this SKU today, with 50 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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