Samsung 64GB DDR5-4800 CL40 RDIMM (M321R8GA0BB0-CQK)
This 64GB DDR5 RDIMM module delivers 4800 MT/s with ECC and registered dual-rank architecture, ensuring data integrity for critical server workloads. Backed by a lifetime replacement warranty and simple installation, it provides a cost-effective path to maximize system performance. This module is best for IT administrators upgrading enterprise servers and workstations that demand reliable, high-capacity memory.
Overzicht
The 30-Second Version
A 64GB ECC registered DDR5 stick built for servers, not desktops. Capacity is top-tier, but latency is near the bottom and the price is painful. Worth it only if your server board demands this exact type of memory.
Pros & Cons
Pluspunten
- Massive 64GB capacity on a single stick 90th
- ECC registered design keeps server data safe 90th
- Dual rank 2Rx4 layout works well in multi-DIMM configs 68th
- JEDEC standard 1.1V keeps power draw predictable
Minpunten
- CL40 latency is one of the worst we've seen
- Price is eye-watering, bottom of the affordability charts
- Not compatible with desktops or laptops at all
- Can't mix with EC4 or other ECC types, so upgrades need planning
De feiten
Performance
The headline here is capacity. A single 64GB module means you can load up a server with a ton of RAM without filling every slot. Speed is 4800 MT/s, which is fine for DDR5 but nothing special, sitting in the middle of the pack. The CL40 latency is where things get rough, landing in the 18th percentile. That's a weak spot for latency-sensitive tasks, but most server workloads care more about capacity and stability than shaving nanoseconds. ECC and registered design keep things stable under load, which matters more than benchmark bragging rights in a data center.
Specifications
Full Specifications
Memory
| Type | DDR5 |
| Form Factor | RDIMM |
| Total Capacity | 65536 |
| Modules | 1 |
| Per Module | 65536 |
| Pins | 288 |
| Rank | 2Rx4 |
Performance
| Speed | 4800 |
| CAS Latency | 40 |
| Voltage | 1.1 |
Class
| ECC | Yes |
| Registered | Yes |
vs Competition
Compared to the Kingston FURY Beast or G.Skill Trident Z5 Royal, this Samsung stick looks slow and overpriced. Those are desktop kits with much tighter timings and higher speeds, but they lack ECC and registered support. The Corsair VENGEANCE RGB and Crucial Pro Overclocking kits are also aimed at enthusiasts, not servers. The KLEVV CRAS V RGB is flashy but again, no ECC. For actual server use, none of those competitors work. This Samsung module wins by default in its category because it's one of the few 64GB registered ECC DDR5 options out there. But if you don't need ECC, every one of those competitors gives you better speed per dollar.
| Spec | Samsung 64GB DDR5 RDIMM | Kingston FURY Beast KF564C32BWEAK2-64 | G.Skill Trident Z5 Royal Series F5-6000J2636H32GX2-TR5NG | Corsair VENGEANCE RGB CMH64GX5M2Y6400C32 | Crucial Pro Overclocking CP2K16G64C32U5B | KLEVV CRAS V RGB KD5KGUD80-60A300G-BLACK |
|---|---|---|---|---|---|---|
| Capacity | 64GB | 64GB | 64GB | 64GB | 32GB | 64GB |
| Kit | 1 x 64GB | 2 x 32GB | 2 x 32GB | 2 x 32GB | 2 x 16GB | 2 x 32GB |
| Memory Type | DDR5 | DDR5 | DDR5 | DDR5 | DDR5 | DDR5 |
| Speed Mts | 4800 | 6400 | 6000 | 6400 | 6400 | 6000 |
| Cas Latency | CL40 | 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 |
| Product | Speed | Feature | Latency | Capacity | Gebruikersoordeel | Affordability |
|---|---|---|---|---|---|---|
| Samsung 64GB DDR5 RDIMM | 67.9 | 89.7 | 17.6 | 89.9 | 32.3 | 2.5 |
| Kingston FURY Beast KF564C32BWEAK2-64 Compare | 94.8 | 89.7 | 87.7 | 89.9 | 92.3 | 7.5 |
| G.Skill Trident Z5 Royal Series F5-6000J2636H32GX2-TR5NG Compare | 87.6 | 89.7 | 99 | 89.9 | 74.2 | 3.4 |
| Corsair VENGEANCE RGB CMH64GX5M2Y6400C32 Compare | 94.8 | 89.7 | 87.7 | 89.9 | 97.8 | 6.8 |
| Crucial Pro Overclocking CP2K16G64C32U5B Compare | 94.8 | 75 | 87.7 | 71.1 | 85.6 | 27.9 |
| KLEVV CRAS V RGB KD5KGUD80-60A300G-BLACK Compare | 87.6 | 89.7 | 87.7 | 89.9 | 85.6 | 8.3 |
Prijs
Value & Pricing
This is expensive, no way around it. The affordability percentile is 3, which means almost everything else in our database costs less. In Europe, prices swing from EUR 2,927 to EUR 3,914 depending on the vendor, so shopping around matters. The best deal we see is on the lower end of that range, but even then you're paying a premium for Samsung's reliability and that 64GB density. If you need this exact module for a server build, it's a necessary cost. If you're just curious, your wallet will thank you for looking elsewhere.
Amazon 1 aanbieding Vanaf € 2.979
We volgen de prijzen van dit product sinds 20 jun 2026. De grafiek verschijnt zodra we meer gegevens hebben.
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Overview
This is a 64GB DDR5 RDIMM built for servers and workstations, not your gaming rig. It runs at 4800 MT/s with CL40 timings and ECC to keep data errors from ruining your day. The capacity is a standout, landing in the 90th percentile in our database, so one stick gives you serious headroom for virtualization or memory-hungry workloads.
But this is not a speed demon. The latency sits near the bottom of the charts, and the price is brutal. You're paying for reliability and density, not raw bandwidth. If your server board takes registered ECC DDR5, this is a solid pick. If you're building a desktop, move along.
Common Questions
Q: Will this work in my desktop PC?
No. This is a registered ECC RDIMM designed for servers and workstations. Desktop motherboards use unbuffered DIMMs, so this stick won't even fit or boot in a standard desktop.
Q: Can I mix this with other ECC memory?
Only if the other modules are also EC8 (10x4) ECC registered DDR5. Mixing with EC4 (9x4) modules or other ECC types like unbuffered or load-reduced can cause instability or failure to boot.
Q: Is 4800 MT/s fast enough for a server?
For most server workloads, yes. Capacity and stability matter more than raw speed in virtualization, databases, and memory-heavy applications. The CL40 latency is high, but that's typical for high-density registered modules.
Who Should Skip This
Skip this if you're building a gaming PC or any desktop system. The registered ECC design means it won't work in consumer boards, and the high latency would hurt gaming performance anyway. Also skip it if you're on a budget, because the price is brutal and there are cheaper server memory options if you don't need 64GB per stick.
Verdict
Buy this if you're building or upgrading a DDR5 server or workstation that requires registered ECC memory and you need maximum capacity per slot. It's reliable, dense, and boring in the best way. Skip it if you're a desktop user or if your workloads are latency-sensitive. This is a tool for stability, not speed.
