64GB DDR5-5600 RDIMM 2RX4 1.1V
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The Samsung M321R8GA0PB0-CWMKH is a high-density 64GB DDR5-5600 dual-rank registered DIMM (2Rx4 RDIMM) engineered for enterprise server environments. Operating at a native 1.1V, this module provides superior bandwidth, improved energy efficiency, and hardware-level stability for modern multi-socket server platforms. It features TAA compliance, making it suitable for government, defense, and strictly regulated enterprise deployments.
The M321R8GA0PB0-CWMKH is architected around Samsung 16Gb B-die DRAM chips arranged in a 2Rx4 (dual-rank, x4 organization) topology across two independent 32-bit subchannels (plus 8 bits of ECC sideband per subchannel). It utilizes a DDR5 Registering Clock Driver (RCD) to buffer address, command, and clock signals, reducing capacitive loading on the server memory bus. In contrast to legacy DDR4 architectures, this DDR5 RDIMM incorporates an on-module Power Management IC (PMIC) to regulate voltages locally (1.1V VDD, 1.1V VDDQ, 1.8V VPP) and an SPD Hub with integrated thermal telemetry.
Reliability is governed by a dual-layer error mitigation scheme comprising DDR5 On-Die ECC (ODECC) for internal bit flips and sideband ECC handled by the host memory controller for end-to-end data transmission protection. Decoding Samsung's part number: 'M321' identifies an enterprise DDR5 RDIMM; '8G' indicates a 64GB capacity density; 'A0' signifies a 2Rx4 structure with 16Gb-based components; 'P' indicates package configuration; 'B0' designates the B-die silicon stepping; 'CWM' defines DDR5-5600 speed bin with standard JEDEC CL46 timing (46-45-45); and the 'H' suffix designates TAA (Trade Agreements Act) compliance.
Always verify against your server's qualified vendor list (QVL).
The TAA designation indicates compliance with the U.S. Trade Agreements Act (19 U.S.C. & 2501-2581). This guarantees the module was manufactured or substantially transformed in a recognized TAA-compliant country, satisfying procurement criteria for U.S. federal and defense contracts.
Yes. The module supports backward compatibility and JEDEC standard clock scaling. If installed in a processor platform like 4th Gen Intel Xeon Scalable (Sapphire Rapids) with a 4800 MT/s memory ceiling, it will safely clock down to DDR5-4800 at corresponding JEDEC timings.
DDR5 RDIMMs integrate an onboard Power Management IC (PMIC) to step down 12V host power directly to 1.1V VDD/VDDQ on the DIMM. This architectural change reduces power loss across motherboard traces, delivers cleaner and more stable power margins, and improves overall power efficiency at 5600 MT/s and above.
The M321R8GA0PB0-CWMKH is a enterprise server memory module (64GB DDR5-5600 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 9 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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