Corsair CMT64GX5M4B6600C32 64GB
- Summary:
- 64GB (4x16GB) DDR5-6600 CL32 Dominator Platinum RGB kit
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Manufacturer: Corsair Last updated: 2026-09-14
Corsair CMT64GX5M4B6600C32 64GB Review
The Corsair CMT64GX5M4B6600C32 is a 64GB (4x16GB) DDR5-6600 CL32 quad-module kit from Corsair's Dominator Platinum RGB line.
6600MT/s CL32 (9.7ns true latency) is genuinely fast, but running it across 4 DIMM slots on top of a speed that's already past AM5's sweet spot makes this an Intel-platform kit specifically, and one that needs a strong memory controller to hit rated speed with all slots populated.
Performance
9.7ns true latency at 6600MT/s CL32 is excellent for DDR5, but expect more tuning effort than a 2-module kit since all 4 DIMM slots are populated.
Compatibility
6600MT/s exceeds AM5's typical sweet spot and 4-DIMM configurations stress the memory controller further, so this is best suited to a high-end Intel board.
Comparison to Alternatives
Corsair's own CMT64GX5M2B6600C32 hits the identical 64GB total and speed with only 2 modules, an easier path to stable full-speed operation if you don't need 4 physical sticks.
Our verdict
Reviewed by Burooj Alam. Rated by us, not by users.
Best for
- High-end Intel workstation builds needing 64GB across 4 slots
Not for
- AMD Ryzen builds
- Boards without a proven memory controller for 4-DIMM high-speed kits
Specifications
What these specs meanHow fast this kit is among DDR5 kits, rated from its speed and latency.
Identity
| Peak Bandwidth | 105.6 GB/s |
|---|---|
| Brand | Corsair |
| Part Number | CMT64GX5M4B6600C32 |
Memory
| DDR Generation | DDR5 |
|---|---|
| Capacity | 64 GB |
| Speed | 6600 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 | Intel |
Capacity
| Capacity Per Module | 16 GB |
|---|
Speed and timings
| True Latency | 9.7 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 CMT64GX5M4B6600C32 64GB (4x16GB)?
Key specs for the Corsair CMT64GX5M4B6600C32 64GB: Capacity Per Module 16 GB, Capacity 64 GB, Speed 6600 MT/s, OC Profile XMP 3.0, DDR Generation DDR5, Form Factor Desktop DIMM.
Will the Corsair CMT64GX5M4B6600C32 64GB (4x16GB) work with my current setup?
The Corsair CMT64GX5M4B6600C32 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 CMT64GX5M4B6600C32 64GB (4x16GB) best suited to?
Best suited to: High-end Intel workstation builds needing 64GB across 4 slots.
What are the drawbacks of the Corsair CMT64GX5M4B6600C32 64GB (4x16GB)?
Not the best fit for: AMD Ryzen builds; Boards without a proven memory controller for 4-DIMM high-speed kits.
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