64GB DDR5-6400 RDIMM 2RX4 1.1V
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The MDRR644QDBC2-3L000 is an enterprise-grade 64GB DDR5-6400 (PC5-51200) Registered DIMM (RDIMM) engineered for high-throughput, mission-critical server environments. Operating at a low 1.1V nominal supply, this dual-rank (2Rx4) module delivers exceptional memory bandwidth and density while minimizing overall server power consumption. It features integrated power management, advanced command/address buffering, and comprehensive error-correction capabilities optimized for next-generation multi-core server platforms.
Built on JEDEC solid-state DDR5 standards, the module employs a 2Rx4 topology populated with 16Gb DRAM dies. DDR5 splits the conventional 64-bit data bus into two independent 32-bit subchannels (each with an additional 8 bits for ECC, totaling 40 bits per subchannel), which substantially improves memory access concurrency and bus efficiency. Buffering and clock distribution are handled by an on-module Registering Clock Driver (RCD), which stabilizes the command, address, and clock signals across the high-speed interface. The module also integrates an on-board Power Management IC (PMIC) and SPD Hub, shifting voltage regulation directly to the DIMM for granular control of VDD (1.1V), VDDQ (1.1V), and VPP (1.8V).
Reliability is reinforced through a dual-layer error management architecture combining internal on-die ECC (ODECC) at the DRAM component level with end-to-end sideband bus ECC handled by the system memory controller. Decoding the part number MDRR644QDBC2-3L000: 'MDRR' identifies the module as an enterprise DDR5 RDIMM series, '64' represents the 64GB total density, '4' signifies the 6400 MT/s data rate binning, while the trailing suffix 'QDBC2-3L000' designates the dual-rank x4 component layout, specific internal silicon stepping/revision, and JEDEC standard latency parameters.
Always verify against your server's qualified vendor list (QVL).
Yes. The module is fully backwards-compatible with JEDEC standards and will automatically downclock to the maximum transfer speed supported by the host processor and motherboard chipset.
No. Registered DIMMs (RDIMMs) cannot be mixed with Unbuffered DIMMs (UDIMMs) or Load-Reduced DIMMs (LRDIMMs). Mixing different memory types within the same system will cause POST failure.
DDR5 moves power management from the motherboard directly onto the module via an onboard PMIC. This provides cleaner, more precise voltage regulation directly to the DRAM dies, reducing board-level noise, power losses, and circuit routing complexity at high data rates like 6400 MT/s.
The MDRR644QDBC2-3L000 is a TAA-compliant enterprise server memory module (64GB 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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