Samsung
Samsung DDR4-3200 ECC RDIMM Spec and Price in the United States
DDR41x64GBRDIMM13.75 ns true latency
Samsung's M393A8G40BB4-CWE is the 64GB DDR4-3200 registered module, 2Rx4 ranks at CL22 and 1.2V per the listing that carries the part number. It tops the DDR4 RDIMM ladder — 3200 MT/s is the highest standard speed DDR4 servers boot — for the later EPYC and Xeon Scalable platforms that accept it, and its part number names the compatibility target for 64GB DDR4 registered memory aftermarkets.
Tied 13th of 18 models in the Server RAM catalog on Speed — 4 models share this figure.
Current best price
Prices exclude sales tax.
Captured periodically and may have changed.- 1x64GB
- 1x32GB
March 19, 202648 capturestoday · $355.85
Each point is one capture, not a list price. How we track prices
Specifications
- Capacity
- 1x64GB
- Memory type
- DDR4
- Speed
- 3200 MT/s
- CAS latency
- Form factor
- RDIMM
- Voltage
- 1.2 V
- Modules
- 1
- RGB
- No
- ECC support
- Yes
Capacities
| Configuration | Part number | Speed | CAS latency | Current best price |
|---|---|---|---|---|
| 1x64GB | M393A8G40BB4-CWE | 3200 MT/s | 22 | $639.00 Price too old to confirm |
| 1x32GB | M393A8K40B22-CWD | 3200 MT/s | 22 | $355.85 at Amazon.com · captured 2026-09-13 |
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.