MTC40F2047S1RC64BB1 — 128GB DDR5-6400 ECC RDIMM 2Rx4 CL46

Specifications

Overview

The Micron MTC40F2047S1RC64BB1 is a 128 GB DDR5-6400 ECC Registered DIMM built as a 2Rx4 module with CL46 latency. DDR5-6400 is the 1-DPC speed the current server generations are specified at, and a x4 dual-rank organisation is what gives a single module the 128 GB density that makes 1-2 TB per socket practical.

On a 12-channel DDR5 platform eight of these modules per socket yield 1 TB and roughly 614 GB/s of theoretical bandwidth per socket; a dual-socket node reaches 2 TB and over 1.2 TB/s. That memory bandwidth, not accelerator FLOPS, is frequently what limits CPU-side inference and in-memory database throughput - which is why RDIMM density and speed remain first-order AI infrastructure decisions.

DDR5 also moves voltage regulation onto the module: an on-DIMM PMIC replaces the motherboard VR, so the module itself is part of the power and thermal design. Micron lists this part under both the standard (MTC40F2047S1RC64BB1) and R (MTC40F2047S1RC64BB1R) ordering forms.

Key Benefits

128 GB on a 2Rx4 module — 1 TB per socket in an 8-DIMM configuration. DDR5-6400 / CL46 — the 1-DPC speed tier current server platforms are specified at. Registered + ECC — corrects single-bit errors and buffers address/command for full-rank loading. On-DIMM PMIC — DDR5 power delivery on the module.

Applications

AI and HPC inference servers, in-memory databases (SAP HANA, Redis, MemSQL class), virtualisation and container hosts, real-time analytics, and large-memory EDA farms.

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