32GB DDR5-5600 RDIMM 1RX4 1.1V
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The Samsung M321R4GA0EB2-CWMXJ (Lenovo Option PN: 4X77A77030) is an enterprise-grade 32GB DDR5-5600 registered DIMM (RDIMM) engineered for mission-critical server environments. Operating at 1.1V with a 1Rx4 configuration, it delivers high-bandwidth memory throughput and low latency for modern compute platforms. This module is certified for high-reliability enterprise platforms including Lenovo ThinkSystem V3 servers powered by 4th/5th Gen Intel Xeon Scalable and AMD EPYC 9004 processors.
This module utilizes a single-rank x4 (1Rx4) layout built on monolithic 16Gb DRAM dies. The DDR5 memory architecture splits the standard 64-bit data bus into two independent 32-bit subchannels (each with 8 additional bits for sideband ECC, totaling 40 bits per subchannel) to enhance channel efficiency and reduce access latency. Signal integrity is maintained via an onboard Register Clock Driver (RCD) that buffers command, address, and clock signals, while data lines connect directly between the DRAM chips and host memory controller.
Power delivery is handled locally by an onboard 12V-to-1.1V Power Management IC (PMIC), replacing legacy motherboard VRMs to provide cleaner power margins and improved power efficiency. It also integrates an SPD Hub with embedded thermal sensors for precision thermal telemetry. In Samsung nomenclature, 'M321' indicates a DDR5 RDIMM, '4G' designates a 32GB total density, 'A0' corresponds to 16Gb die organization, 'EB2' specifies die generation and PCB stepping, and 'CWM' denotes DDR5-5600B (CL46) timing. Lenovo part number 4X77A77030 identifies this module as a factory-certified TruDDR5 option.
Always verify against your server's qualified vendor list (QVL).
Yes, the module is backwards compatible and will automatically downclock to DDR5-4800 or DDR5-4400 depending on processor memory controller support, slot population, and motherboard UEFI profiles.
A 1Rx4 organization uses x4-width DRAM devices, enabling advanced multi-bit chipkill error correction where an entire failing chip can be corrected, unlike x8 memory. Single-rank also imposes lower capacitive load on the memory channel, often allowing higher peak operating frequencies in dense configurations.
While physically and electrically compliant with JEDEC DDR5 RDIMM specifications, this module carries Lenovo TruDDR5 SPD firmware. While it will physically function in many standard platforms (such as generic Supermicro or Tyan), some vendor platforms (e.g., Dell or HPE) may flag non-OEM warnings in iDRAC or iLO.
The M321R4GA0EB2-CWMXJ - 4X77A77030 is a TAA-compliant enterprise server memory module (32GB DDR5-5600 RDIMM 1RX4 1.1V). Sold as factory-sealed OEM stock with a 1-year warranty and same-day US shipping when in stock. We stock 52 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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