128GB DDR5-6400 RDIMM 2RX4 1.1V
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The Samsung M321RAJA0MB2-CCPKF is an enterprise-grade 128GB DDR5-6400 registered dual-rank (2Rx4) memory module engineered for mission-critical hyperscale and cloud computing environments. Utilizing high-density monolithic 32Gb DRAM dies, this RDIMM delivers an impressive peak transfer rate of 51200 MB/s at 1.1V, optimizing bandwidth and energy efficiency. It is designed for next-generation platforms requiring massive memory footprints without the latency and thermal penalties associated with 3DS-stacked packaging.
The M321RAJA0MB2-CCPKF is built on Samsung's advanced M-die node using native monolithic 32Gb DRAM chips organized in a 2Rx4 (dual rank, x4 bit width) topology. The part number decodes as: M321 (DDR5 RDIMM), R (Registered), A (16G Depth), J (32Gb die density), A (bank configuration/refresh), 0 (1.1V standard voltage), M (M-die revision), B (FBGA package), 2 (PCB design revision), and CCPKF (commercial temperature grading with PK representing DDR5-6400 timing, typically CL52-52-52).
DDR5 architectural enhancements feature two independent 32-bit sub-channels (plus 8 bits of ECC sideband each for a 40-bit sub-channel width), significantly improving memory access concurrency and bus efficiency over DDR4. Signal integrity for command, address, and clock lines is managed by an onboard Registering Clock Driver (RCD). Power regulation is localized via an on-DIMM Power Management IC (PMIC), receiving a 12V input rail from the motherboard to precisely generate 1.1V VDD/VDDQ and 1.8V VPP rails. System telemetry and configuration are handled via an integrated SPD Hub with onboard thermal sensors, while enterprise-grade reliability is ensured through the combination of DRAM-level on-die ECC (ODECC) and end-to-end sideband ECC at the system memory controller.
Always verify against your server's qualified vendor list (QVL).
No. Unlike earlier 128GB DDR5 modules that relied on 2-high stacked 16Gb dies (2H 3DS), this module uses native monolithic 32Gb DRAM dies, reducing physical package complexity, parasitic capacitance, thermal output, and manufacturing costs.
Yes, the module is backward compatible and will downclock automatically based on platform and population limits (e.g., 5600 MT/s or 4800 MT/s on 4th/5th Gen Intel Xeon Scalable or AMD EPYC 9004 series), provided the BIOS and motherboard support 32Gb monolithic die density.
DDR5 moves voltage regulation from the motherboard to the module itself. The onboard PMIC steps down an incoming 12V supply to the module's operating rails (1.1V VDD/VDDQ and 1.8V VPP), ensuring tighter voltage regulation, lower noise, and improved signal integrity at 6400 MT/s.
The M321RAJA0MB2-CCPKF 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 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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