128GB DDR5-6400 RDIMM 2RX4 1.1V
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The Samsung M321RAJA0MB2-CCPPC is an enterprise-grade 128GB DDR5-6400 (PC5-51200) Registered DIMM (RDIMM) engineered for memory-intensive datacenter and cloud workloads. Operating at a low 1.1V nominal supply, this dual-rank (2Rx4) module utilizes high-density 32Gb monolithic DRAM dies to deliver high memory capacity without stacking penalties. It provides enterprise-class reliability and data integrity through an onboard Registering Clock Driver (RCD), on-module PMIC, and comprehensive multi-tier ECC.
The M321RAJA0MB2-CCPPC is built upon JEDEC DDR5 synchronous DRAM architecture, featuring high-density 32Gb monolithic silicon dies configured in a dual-rank x4 (2Rx4) topology. DDR5 replaces the legacy single 72-bit bus with two independent 40-bit subchannels (32 data bits plus 8 sideband ECC bits each), doubling concurrency and improving memory bus efficiency. Signal buffering is managed by a dedicated DDR5 Registering Clock Driver (RCD), re-driving command, address, and clock signals to maintain clean margins across high-speed 6400 MT/s traces.
Power regulation is shifted directly to the DIMM via an onboard Power Management IC (PMIC), which down-converts 12V host power into precision 1.1V (VDD/VDDQ) and 1.8V (VPP) rails while isolating against motherboard voltage noise. Thermal management and telemetry are supported by an integrated SPD Hub with integrated thermal sensors. Decoding the Samsung part number reveals: 'M321' indicates an enterprise DDR5 RDIMM; 'R' denotes DDR5 technology; 'A' corresponds to 128GB total density; 'J' defines the 2Rx4 rank and chip width organization; 'A0' indicates die revision and packaging; 'MB2' refers to internal PCB design and controller revision; and 'CCPPC' specifies DDR5-6400 timing bins (CL52) with standard commercial temperature profiles.
Always verify against your server's qualified vendor list (QVL).
The M321RAJA0MB2-CCPPC utilizes native monolithic 32Gb DRAM dies organized in a 2Rx4 design. This eliminates the thermal resistance and slight electrical latency associated with 3DS TSV (Through-Silicon Via) dual-die or quad-die stacked packages.
Yes. JEDEC DDR5 specifications mandate full backward compatibility. If installed in server platforms based on 4th or 5th Gen Intel Xeon Scalable or AMD EPYC 9004 processors, the RDIMM will automatically adjust to 4800 MT/s or 5600 MT/s based on CPU capabilities and slot population rules.
This module features two layers of error correction: JEDEC standard On-Die ECC (ODECC) within the DRAM chips to repair single-bit internal cell errors, and module-level sideband ECC across the dual 40-bit channels to protect data in transit between the memory controller and the DIMM.
The M321RAJA0MB2-CCPPC 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 56 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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