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Manufacturer: Corsair Last updated: 2026-09-14
Corsair CMT64GX5M4B6400C32 64GB Review
The Corsair CMT64GX5M4B6400C32 is a 64GB (4x16GB) DDR5-6400 CL32 quad-module kit from Corsair's Dominator Platinum RGB line.
6400MT/s CL32 computes to a strong 10.0ns true latency, but running it across all 4 DIMM slots is more demanding on the memory controller than a 2-module kit of the same total capacity, so treat the rated speed as a target to tune toward rather than a guaranteed out-of-box result on every board.
Performance
10.0ns true latency at 6400MT/s CL32 is a genuinely good result, on par with a well-tuned 6000MT/s CL30 kit, while the quad-module layout delivers a full 64GB.
Compatibility
6400MT/s across 4 DIMMs asks more of the IMC than a 2-module kit; expect to need a capable board and possibly some manual tuning to hit the rated speed reliably on every platform.
Comparison to Alternatives
Corsair's own CMT64GX5M2B6000C40 reaches the same 64GB total in just 2 modules, generally the easier path to stable full-speed operation if you don't specifically need 4 DIMM slots filled.
Our verdict
Reviewed by Burooj Alam. Rated by us, not by users.
Best for
- Workstation builds needing the full 64GB across 4 slots
- Buyers who want both high capacity and strong timings in one kit
Not for
- Boards with a weaker memory controller that may struggle at full rated speed with 4 DIMMs populated
Specifications
What these specs meanHow fast this kit is among DDR5 kits, rated from its speed and latency.
Identity
| Peak Bandwidth | 102.4 GB/s |
|---|---|
| Brand | Corsair |
| Part Number | CMT64GX5M4B6400C32 |
Memory
| DDR Generation | DDR5 |
|---|---|
| Capacity | 64 GB |
| Speed | 6400 MT/s |
| CAS Latency | 32 |
| Module Count | 4 |
Physical
| RGB Lighting | Yes |
|---|
Module and platform
| RAM Segment | Desktop DDR5 |
|---|---|
| Form Factor | Desktop DIMM |
| Platform Optimisation | AM5 |
Capacity
| Capacity Per Module | 16 GB |
|---|
Speed and timings
| True Latency | 10.0 ns |
|---|
Overclocking profile
| XMP Support | Yes |
|---|---|
| XMP Version | XMP 3.0 |
| EXPO Support | No |
Silicon
| Memory IC | Undisclosed |
|---|
Physical and lighting
| Colour | Black |
|---|
FAQs
What are the key specifications of the Corsair CMT64GX5M4B6400C32 64GB (4x16GB)?
Key specs for the Corsair CMT64GX5M4B6400C32 64GB: Capacity Per Module 16 GB, Capacity 64 GB, Speed 6400 MT/s, OC Profile XMP 3.0, DDR Generation DDR5, Part Number CMT64GX5M4B6400C32.
Will the Corsair CMT64GX5M4B6400C32 64GB (4x16GB) work with my current setup?
The Corsair CMT64GX5M4B6400C32 64GB (4x16GB) lists DDR Generation is DDR5. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits. Our upgrade checker at /upgrade can confirm compatibility for common combinations.
Who is the Corsair CMT64GX5M4B6400C32 64GB (4x16GB) best suited to?
Best suited to: Workstation builds needing the full 64GB across 4 slots; Buyers who want both high capacity and strong timings in one kit.
What are the drawbacks of the Corsair CMT64GX5M4B6400C32 64GB (4x16GB)?
Not the best fit for: Boards with a weaker memory controller that may struggle at full rated speed with 4 DIMMs populated.
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