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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
$2,159.99Price too old to confirm

Prices exclude sales tax.

The last tracked price for the 1x64GB Samsung DDR5-5600 ECC RDIMM in the United States was $2,159.99 at Amazon.com, captured 2026-08-30. Across one tracked merchant and 486 days of recorded prices, the 90-day median for the 1x64GB Samsung DDR5-5600 ECC RDIMM is $2,461.70 and the lowest recorded price is $203.89. This site began capturing prices on July 30, 2026; for Amazon listings, prices dated earlier come from Keepa's price history.

Captured periodically and may have changed.

Price history

30D90D180DAll
  • 1x64GB
  • 1x64GB 4800 CL40
August 13, 202660 data pointstoday · $2,574.00

Each point is one day's recorded price, not a list price. Points dated before July 30, 2026, when this site began capturing prices, come from Keepa's Amazon price history. 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

$2,159.99

Price too old to confirm

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.