Corsair CMK64GX5M4B6600C32 64GB
- DDR Generation:
- DDR5
- Capacity:
- 64GB (4x16GB)
- Speed:
- 6600 MT/s
- CAS Latency:
- CL32
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Manufacturer: Corsair Last updated: 2026-09-14
Corsair CMK64GX5M4B6600C32 64GB (4x16GB) DDR5 Desktop RAM Kit Review
Need 64GB across four DIMM slots rather than two? The Corsair CMK64GX5M4B6600C32 is a 4x16GB DDR5-6600 CL32 Vengeance kit built for boards with four memory slots.
9.7ns true latency is genuinely excellent — among the best in this catalog — but running four single-rank modules puts more electrical load on the memory controller than a 2-module kit, so expect this to be pickier about which motherboards run it at full rated speed.
Performance
9.7ns true latency at 6600MT/s CL32 is a standout result, beating Corsair's own 2-module 6000MT/s kits on raw latency. Populating all four DIMM slots does typically mean the memory controller runs at a lower stable frequency than the same total capacity split across two higher-density modules, so real-world clocks can land below the rated 6600MT/s on some boards.
Compatibility
Running 4 modules is inherently harder on a motherboard's memory controller than 2. If your board only has two DIMM slots, or you're not confident about 4-DIMM DDR5 stability at 6600MT/s, a 2x32GB kit like CMK64GX5M2B6000C40 reaches the same 64GB total more reliably.
Specifications
Identity
| Brand | Corsair |
|---|---|
| Part Number | CMK64GX5M4B6600C32 |
Memory
| DDR Generation | DDR5 |
|---|---|
| Capacity | 64 GB |
| Speed | 6600 MT/s |
| CAS Latency | 32 |
| Module Count | 4 |
Physical
| Form Factor | Desktop DIMM |
|---|---|
| RGB Lighting | No |
Module and platform
| RAM Segment | Desktop DDR5 |
|---|
Capacity
| Capacity Per Module | 16 GB |
|---|
Speed and timings
| True Latency | 9.7 ns |
|---|
Silicon
| Memory IC | Undisclosed |
|---|
Physical and lighting
| Colour | Black |
|---|
| Platform Sweet Spot | AM5 |
|---|---|
| Spec Score | 6.6 |
Expert Review
Reviewed by Burooj Alam. Rated by us, not by users.
Best for
- 4-DIMM-slot motherboards needing the full 64GB across all slots
- Buyers who specifically want four physical modules rather than two
Not for
- 2-DIMM-slot boards — use a 2x32GB kit instead
- Buyers unsure about 4-DIMM DDR5 stability at high speeds on their specific board
FAQs
What are the key specifications of the Corsair CMK64GX5M4B6600C32 64GB (4x16GB) DDR5 Desktop RAM Kit?
The Corsair CMK64GX5M4B6600C32 64GB (4x16GB) DDR5 Desktop RAM Kit is a memory kit from Corsair. Key specs: DDR Generation DDR5, Capacity 64GB (4x16GB), Speed 6600MT/s, CAS Latency 32, Module Count 4.
Will the Corsair CMK64GX5M4B6600C32 64GB (4x16GB) DDR5 Desktop RAM Kit work with my current setup?
The Corsair CMK64GX5M4B6600C32 64GB (4x16GB) DDR5 Desktop RAM Kit 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 CMK64GX5M4B6600C32 64GB (4x16GB) DDR5 Desktop RAM Kit best suited to?
It suits 4-dimm-slot motherboards needing the full 64gb across all slots, buyers who specifically want four physical modules rather than two.
What are the drawbacks of the Corsair CMK64GX5M4B6600C32 64GB (4x16GB) DDR5 Desktop RAM Kit?
It is a poor fit for 2-dimm-slot boards — use a 2x32gb kit instead, buyers unsure about 4-dimm ddr5 stability at high speeds on their specific board.
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