Micron 128GB DDR5-6400 CL52 RDIMM (MTC40F2047S1RC64BB1R)
The 128GB DDR5 RDIMM runs at 6400 MT/s with CL52 latency, built for high-capacity server memory with ECC and registered support. Its 2Rx4 configuration and 288-pin design fit standard server boards, while the single-pack format simplifies upgrades. Best for server administrators needing dense memory for virtualization or large databases, scoring 87.1/100 in server workloads.
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概览
The 30-Second Version
128GB of DDR5 at 6400 MT/s is a beast for servers, but CL52 latency is rough and the price is eye-watering. It's a niche product for RDIMM-compatible builds that need max density. If that's you, it's one of the best options out there. If not, look elsewhere.
Pros & Cons
优点
- Massive 128GB capacity on a single module 97th
- 6400 MT/s speed is near the top of our charts 95th
- ECC and registered design for server stability 90th
- Strong feature set for enterprise use
缺点
- CL52 latency is one of the worst we've seen
- Only works in RDIMM-compatible boards
- Price is brutal at around $9,999 USD
- Almost no social proof or reviews out there
实测数据
Performance
6400 MT/s is top of the charts for DDR5, and 128GB on a single stick is best-in-class capacity. That combo means serious bandwidth for memory-hungry server workloads. But CL52 latency is a weak spot. It's not going to feel snappy in latency-sensitive tasks, and it falls behind most kits we've tested there. For servers chewing through huge datasets, the bandwidth and capacity win. For anything latency-bound, this isn't the pick.
Specifications
Full Specifications
Memory
| Type | DDR5 |
| Form Factor | RDIMM |
| Total Capacity | 131072 |
| Modules | 1 |
| Per Module | 131072 |
| Pins | 288 |
| Rank | 2Rx4 |
Performance
| Speed | 6400 |
| CAS Latency | 52 |
Class
| ECC | Yes |
| Registered | Yes |
vs Competition
Compared to the Kingston FURY Beast or Corsair Vengeance kits, this Micron stick is in a different league for capacity but loses badly on latency and price. Those kits are aimed at gamers and enthusiasts with tighter timings and much lower cost per gigabyte. The G.Skill Trident Z5 Royal also runs at 6000 MT/s with better latency and a fraction of the price. If you need ECC and registered memory for a server, none of those consumer kits will work, so the Micron stands alone. But if you don't need RDIMM, skip it.
| Spec | Micron 128GB DDR5 RDIMM | Kingston FURY Beast KF564C32BWEAK2-64 | G.Skill Trident Z5 Royal Series F5-6000J2636H32GX2-TR5NG | Corsair VENGEANCE RGB CMH64GX5M2Y6400C32 | Crucial Pro Overclocking CP2K16G64C32U5B | ADATA Lancer Blade RGB AX5U6000C3016G-DTLABRBK |
|---|---|---|---|---|---|---|
| Capacity | 128GB | 64GB | 64GB | 64GB | 32GB | 32GB |
| Kit | 1 x 128GB | 2 x 32GB | 2 x 32GB | 2 x 32GB | 2 x 16GB | 2 x 16GB |
| Memory Type | DDR5 | DDR5 | DDR5 | DDR5 | DDR5 | DDR5 |
| Speed Mts | 6400 | 6400 | 6000 | 6400 | 6400 | 6000 |
| Cas Latency | CL52 | CL32 | CL26 | CL32 | CL32 | CL30 |
| Form Factor | RDIMM | UDIMM | UDIMM | UDIMM | UDIMM | UDIMM |
| Ecc | true | false | false | false | false | false |
| Compare | Compare | Compare | Compare | Compare |
| 产品 | Speed | Feature | Latency | Capacity | 用户口碑 | Affordability |
|---|---|---|---|---|---|---|
| Micron 128GB DDR5 RDIMM | 94.8 | 89.7 | 26 | 97 | 15.3 | 1 |
| Kingston FURY Beast KF564C32BWEAK2-64 Compare | 94.8 | 89.7 | 87.7 | 89.9 | 92.3 | 7.7 |
| G.Skill Trident Z5 Royal Series F5-6000J2636H32GX2-TR5NG Compare | 87.7 | 89.7 | 99 | 89.9 | 74.2 | 3.2 |
| Corsair VENGEANCE RGB CMH64GX5M2Y6400C32 Compare | 94.8 | 89.7 | 87.7 | 89.9 | 97.8 | 6.9 |
| Crucial Pro Overclocking CP2K16G64C32U5B Compare | 94.8 | 75 | 87.7 | 71.1 | 85.6 | 27.8 |
| ADATA Lancer Blade RGB AX5U6000C3016G-DTLABRBK Compare | 87.7 | 89.7 | 87.7 | 71.1 | 97.8 | 15.8 |
价格
Value & Pricing
At $9,999 USD for a single stick, this is not a casual purchase. You're paying a premium for 128GB on one module at high speed, and that's a niche need. If you're building a server with limited DIMM slots and need maximum density, the price might make sense. For everyone else, you can get far better value with smaller, cheaper kits. The affordability percentile is dead last in our database, and it shows.
了解更多
Overview
This is a 128GB stick of DDR5 RDIMM running at 6400 MT/s. That's a massive amount of memory on a single module, and the speed is right up there with the best DDR5 we've tracked. It's built for servers and heavy workstations, not your average gaming rig.
The catch? It's registered ECC memory, so it only works in boards that support RDIMMs. And the latency is rough. CL52 at 6400 MT/s puts it near the bottom of our database for responsiveness. But for raw capacity and bandwidth, this thing is a monster.
Common Questions
Q: Will this work in a regular desktop motherboard?
No. This is a registered ECC RDIMM, so it requires a server or workstation board that explicitly supports RDIMMs. Standard consumer boards use UDIMMs and won't even post with this stick.
Q: Is the high latency a problem for my workload?
It depends. For bandwidth-heavy tasks like large data transfers or virtualization, the 6400 MT/s speed matters more. For latency-sensitive work like gaming or some database operations, CL52 will feel sluggish compared to lower-latency kits.
Q: Can I mix this with other memory sticks?
Technically you can mix it with other RDIMMs, but you'll likely drop to the speed and timings of the slowest module. For best results, use identical sticks in matched sets.
Who Should Skip This
Skip this if you're building a gaming PC or a standard desktop. The RDIMM requirement alone rules out most consumer boards, and the latency is a real letdown for gaming. If you don't need ECC or 128GB per stick, you're paying a huge premium for features you'll never use.
Verdict
This is for server admins and workstation builders who need maximum memory density in a single slot. If your board supports RDIMMs and you're running virtualization, large databases, or heavy rendering, the 128GB capacity is a real advantage. Everyone else should look at cheaper, lower-latency options.
