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Samsung

Samsung DDR5-5600 ECC RDIMM Spec and Price in the United States

DDR51x64GBRDIMM16.43 ns true latency

Samsung's M321R8GA0PB0-CWM is the 64GB DDR5-5600 registered module of the M321 family, running 2Rx4 ranks (EC8, 10x4) at CL46 and 1.1V with on-die ECC plus the buffer-and-register circuit RDIMMs need for multi-module-per-channel servers. The part number is the identity — listings that carry it state the same 5600 MT/s, 2Rx4 profile — and Samsung's own modules are the compatibility baseline most server motherboards validate against, which is why the aftermarket builds 'compatible with M321R8GA0PB0-CWM' into its listings.

Tied 4th of 18 models in the Server RAM catalog on Speed — 5 models share this figure.

Current best price
$2,408.99at Amazon.com · captured 2026-09-15View at Amazon.com

Prices exclude sales tax.

Captured periodically and may have changed.

Price history

30D90D180DAll
  • 1x64GB
  • 1x64GB 4800 CL40
May 2, 2026180 capturestoday · $2,576.09

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

Specifications

Capacity
1x64GB
Memory type
DDR5
Speed
5600 MT/s
CAS latency
Form factor
RDIMM
Voltage
1.1 V
Modules
1
RGB
No
ECC support
Yes

Capacities

ConfigurationPart numberSpeedCAS latencyCurrent best price
1x64GBM321R8GA0PB0-CWM5600 MT/s46
$2,408.99

at Amazon.com · captured 2026-09-15

1x64GB 4800 CL40M329R8GA0BB0-CQK4800 MT/s40—

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.