128GB DDR5-7200 RDIMM 2RX4 1.1V
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The Samsung M321RAJA0MB2-CJREK is an enterprise-grade 128GB DDR5-7200 Registered DIMM (RDIMM) engineered for cutting-edge datacenter, AI, and hyperscale virtualization platforms. Operating at 1.1V with a high-speed transfer rate of 7200 MT/s (PC5-57600), this dual-rank x4 module provides exceptional bandwidth and memory density. Built with monolithic 32Gb DRAM dies, it enhances power efficiency and signal integrity for next-generation multi-core server processors.
The module employs a dual-rank x4 (2Rx4) architecture utilizing high-density 32Gb monolithic DDR5 DRAM components. Rather than relying on Through-Silicon Via (3DS) die-stacking, the use of monolithic 32Gb silicon achieves a 128GB capacity across two ranks with lower parasitic capacitance, reduced latency, and improved thermal characteristics. In conformance with JEDEC DDR5 specifications, the DIMM features dual independent 32-bit subchannels (each with 8 additional ECC bits, creating two 40-bit subchannels per rank), doubling concurrent command access and boosting bus efficiency compared to DDR4. Signaling is stabilized by a high-speed Registering Clock Driver (RCD), and board-level power regulation is handled directly by an onboard Power Management IC (PMIC) converting host 12V input to 1.1V VDD/VDDQ and 1.8V VPP rails. The module integrates an SPD Hub with built-in thermal telemetry and delivers robust data protection through a combination of silicon-level On-Die ECC (ODECC) and end-to-end system sideband ECC. In the part number M321RAJA0MB2-CJREK, 'M321' indicates a Samsung DDR5 RDIMM, 'R' identifies DDR5 SDRAM, 'AJ' designates high-density 32Gb-based depth, 'M' denotes component revision, 'B2' signifies packaging and ball configuration, and 'CJR' identifies the DDR5-7200 JEDEC speed grade.
Always verify against your server's qualified vendor list (QVL).
Yes. The module's SPD contains standard JEDEC fallbacks, allowing it to seamlessly downclock to DDR5-6400, DDR5-5600, or DDR5-4800 depending on processor memory controller capabilities and DIMM-per-channel population rules.
No. By utilizing native monolithic 32Gb DRAM dies, this module achieves 128GB in a standard dual-rank (2Rx4) configuration without TSV stacking, offering improved thermal profiles and lower latency compared to 3DS-based modules.
The DDR5 specification moves power management directly onto the DIMM. The onboard PMIC takes a 12V supply from the motherboard and regulates it locally to 1.1V and 1.8V rails for cleaner power and reduced voltage drop, while the SPD Hub manages configuration data and provides real-time thermal telemetry.
The M321RAJA0MB2-CJREK is a TAA-compliant enterprise server memory module (128GB DDR5-7200 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.
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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