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Samsung

Samsung DDR4-2666 ECC RDIMM Spec and Price in the United Kingdom

DDR41x32GBRDIMM14.25 ns true latency

Samsung's M393A4K40CB2-CTD is the 32GB DDR4-2666 registered module, 2Rx4 ranks at CL19 and 1.2V — the JEDEC profile DDR4 RDIMMs from the first EPYC and Xeon Scalable generations actually run. DDR4 registered modules keep command and address signals buffered on-die, so this line is the capacity upgrade path for the large installed base of 2666 MT/s servers, and the M393 part number is the compatibility reference the rest of the aftermarket names its DDR4 RDIMMs against.

Tied 17th of 18 models in the Server RAM catalog on Speed — 2 models share this figure.

Current best price
£251.99at Amazon.co.uk · captured 2026-09-15View at Amazon.co.uk

Prices include VAT.

Captured periodically and may have changed.

Price history

30D90D180DAll
  • 1x32GB
March 30, 202641 capturestoday · £250.99

Each point is one capture, not a list price. How we track prices

Specifications

Capacity
1x32GB
Memory type
DDR4
Speed
2666 MT/s
CAS latency
Form factor
RDIMM
Voltage
1.2 V
Modules
1
RGB
No
ECC support
Yes

Capacities

ConfigurationPart numberCurrent best price
1x32GBM393A4K40CB2-CTD
£251.99

at Amazon.co.uk · captured 2026-09-15

Guides for this category

How much RAM you actually needHow to size memory from the pressure your machine is under now, why running short quietly costs speed, and when a matched pair beats one stick.RAM speed and latency, and when they matterWhat a kit's MT/s and CAS latency each measure, why true latency is the two together, and the machines where the numbers actually change anything.SO-DIMM vs DIMM: the memory a laptop takesWhy laptop memory is a different module from desktop memory, how DDR4 and DDR5 are keyed apart, and why some machines take no module at all.What is ECC memory, and when you need itWhat error-correcting memory actually catches, how registered and load-reduced modules differ from unbuffered ones, and why the platform decides.

Sources

Every spec above was pulled from one of these — a field a source didn't state was left off rather than estimated.