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Green rectangular RDIMM module with gold contacts and black chips 128GB DDR5 6400 CL52

Micron

Micron MTC40F2047S1RC64BR DDR5 RDIMM 128GB 2Rx4 6400 CL52 server RAM

SKU CH-10SY-043S3 MPN MTC40F2047S1RC64BR

128 GB DDR5 registered ECC module running at 6400 MT/s with CL52 latency

  • 128 GB capacity supports large-scale virtualization and databases
  • 6400 MT/s speed delivers high memory bandwidth for demanding workloads
  • DDR5 technology provides improved efficiency over previous generations
  • ECC and registered design protect data integrity in critical applications
  • 2Rx4 organization with 32 Gbit density optimizes signal loading for stability

Server RDIMM for high-capacity workloads

The Micron MTC40F2047S1RC64BR is a 128 GB DDR5 RDIMM built for servers that need large memory footprints. Registered signal processing and on-die ECC protect data integrity in multi-socket platforms. The module uses a 2Rx4 organisation based on 32 Gbit DRAM devices. It targets virtualisation hosts, in-memory databases and compute clusters.

Thermals and power at 1.1 V

Operating at 1.1 V, the module draws less power per gigabyte than previous DDR generations. The registered buffer reduces electrical load on the memory controller, helping system fans run quieter during typical utilisation. No additional cooling beyond standard server airflow is required. Efficiency scales with the number of populated slots.

Sustained throughput at 6400 MT/s

Rated at 6400 MT/s (PC5-51200) with CL52 latency, the module maintains rated bandwidth across extended compute windows. The registered architecture keeps signal integrity stable when all channels are fully populated. Workloads such as checkpointing, large-scale simulation and analytics benefit from consistent throughput. Performance remains bounded by the platform memory controller.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $5,280.99
Pricier than about 90% of the 6,523 comparable items (median $188.99).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Size & build
Shipping weight0.45 kg
Package size127 × 51 × 13 mm

Questions about this item

How do I install this Micron MTC40F2047S1RC64BR RDIMM in a server, and what step is often missed?

Align the notch with the slot key, press firmly until both retention clips click, and ensure the system BIOS recognises the 6400 MT/s speed and 1.1 V voltage.

What maintenance or replacement will this 128 GB DDR5 module need later?

No routine maintenance is required; if a memory error occurs, run the platform diagnostics and replace the module if ECC correctable errors exceed the platform threshold.

What limit appears first when this CL52 RDIMM runs sustained workloads?

The CAS latency of CL52 at 6400 MT/s sets the timing floor; thermal throttling may engage if chassis airflow cannot dissipate heat from the 2Rx4 organisation.

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