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Samsung

Samsung DDR5-6400 ECC RDIMM Spec and Price in the United States

DDR51x64GBRDIMM16.25 ns true latency

Samsung's M321R8GA0EB2 is the 64GB DDR5-6400 registered module, running 2Rx4 ranks at CL52 and 1.1V per the listings that carry the part number. It is the same M321 family and single-module shape as the 5600 line, one speed grade higher for servers whose memory controllers support 6400 MT/s — the class the newest EPYC and Xeon platforms boot — and it doubles as the compatibility target aftermarket RDIMMs are built to mimic.

Tied 1st of 18 models in the Server RAM catalog on Speed — 3 models share this figure.

Current best price
$4,163.07at Amazon.com · captured 2026-09-12View at Amazon.com

Prices exclude sales tax.

Captured periodically and may have changed.

Price history

30D90D180DAll
  • 1x64GB
April 10, 202623 capturestoday · $4,163.07

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

Specifications

Capacity
1x64GB
Memory type
DDR5
Speed
6400 MT/s
CAS latency
Form factor
RDIMM
Voltage
1.1 V
Modules
1
RGB
No
ECC support
Yes

Capacities

ConfigurationPart numberCurrent best price
1x64GBM321R8GA0EB2
$4,163.07

at Amazon.com · captured 2026-09-12

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.