Samsung M393A4K40CB2-CTD
This 256GB kit delivers high-capacity registered ECC memory at 2666 MT/s with CL19 latency, ensuring data integrity for always-on server environments. The eight 32GB RDIMMs provide a cost-effective path to dense memory configurations in dual-socket systems. It’s best for IT administrators upgrading virtualization hosts or database servers that require large memory pools and error correction.
Capacity 128GB
Kit 8 x 32GB
Memory DDR4
Speed 2666 MT/s
CAS Latency CL19
Form Factor RDIMM
ECC Yes
62 Overall Score
Price $499
Snapshot
Pros & Cons
Pros
- Strong capacity (97th percentile) 97th
- Strong feature (96th percentile) 96th
- Strong social proof (74th percentile) 74th
Cons
What owners think
How owner sentiment changed over time
ExclusiveBased on when customers actually wrote their reviews - so you can see whether early praise held up.
Owner sentiment has improved over time
Based on 17 dated customer reviews, grouped by calendar quarter. Period analysis is in English.
The proof
Performance
Specifications
Full Specifications
Memory
| Type | DDR4 |
| Form Factor | RDIMM |
| Total Capacity | 131072 |
| Modules | 8 |
| Per Module | 32768 |
| Pins | 288 |
Performance
| Speed | 2666 |
| CAS Latency | 19 |
Class
| ECC | Yes |
| Registered | Yes |
Features
| RGB | No |
vs Competition
| Spec | Samsung M393A4K40CB2-CTD | Kingston FURY Beast KF564C32BWEAK2-64 | Corsair VENGEANCE RGB CMH64GX5M2Y6400C32 | G.Skill Flare X5 F5-6000J2836G32GX2-FX5 | Crucial Pro Overclocking CP2K16G64C32U5B | KLEVV CRAS V RGB KD5BGUA80-60A300J |
|---|---|---|---|---|---|---|
| Capacity | 128GB | 64GB | 64GB | 64GB | 32GB | 64GB |
| Kit | 8 x 32GB | 2 x 32GB | 2 x 32GB | 2 x 32GB | 2 x 16GB | 2 x 32GB |
| Memory Type | DDR4 | DDR5 | DDR5 | DDR5 | DDR5 | DDR5 |
| Speed Mts | 2666 | 6400 | 6400 | 6000 | 6400 | 6000 |
| Cas Latency | CL19 | CL32 | CL32 | CL28 | CL32 | CL30 |
| Form Factor | RDIMM | UDIMM | UDIMM | UDIMM | UDIMM | UDIMM |
| Ecc | true | false | false | false | false | false |
| Compare | Compare | Compare | Compare | Compare |
| Product | Speed | Feature | Latency | Capacity | Social Proof |
|---|---|---|---|---|---|
| Samsung M393A4K40CB2-CTD | 37.5 | 95.8 | 35.9 | 97 | 73.6 |
| Kingston FURY Beast KF564C32BWEAK2-64 Compare | 94.7 | 87 | 87.5 | 89.9 | 93.4 |
| Corsair VENGEANCE RGB CMH64GX5M2Y6400C32 Compare | 94.7 | 87 | 87.5 | 89.9 | 98.2 |
| G.Skill Flare X5 F5-6000J2836G32GX2-FX5 Compare | 87.4 | 72.9 | 97.2 | 89.9 | 74.6 |
| Crucial Pro Overclocking CP2K16G64C32U5B Compare | 94.7 | 72.9 | 87.5 | 70.9 | 87.7 |
| KLEVV CRAS V RGB KD5BGUA80-60A300J Compare | 87.4 | 87 | 87.5 | 89.9 | 87.7 |
Price
Value & Pricing
From $499
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Price History
Usage Scores
A full written review is coming soon. The specs, scores, prices and charts above are always up to date.
