Corsair

Corsair CMT64GX5M2B6600C32 64GB

Summary:: 64GB (2x32GB) DDR5-6600 CL32 Dominator Platinum RGB kit

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Manufacturer: Corsair Last updated: 2026-09-14

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Corsair CMT64GX5M2B6600C32 64GB Review

The Corsair CMT64GX5M2B6600C32 is a 64GB (2x32GB) DDR5-6600 CL32 kit from Corsair's Dominator Platinum RGB line.

This is one of the stronger 64GB Dominator Platinum RGB options on paper: 6600MT/s CL32 works out to 9.7ns true latency, beating even the 6000MT/s CL30 version of this kit, but 6600MT/s is past AM5's comfortable range so it's really an Intel pick.

Performance

9.7ns true latency at 6600MT/s CL32 is a genuinely excellent result, edging out the 6000MT/s CL30 kit's 10.0ns while also carrying more bandwidth, all at a full 64GB.

Compatibility

6600MT/s runs past AM5's typical sweet spot, dropping Ryzen boards to a slower fabric ratio; this kit performs best on Intel Z790/Z890 boards with a strong memory controller.

Comparison to Alternatives

Corsair's own CMT64GX5M2B6000Z30 is the AM5-friendly equivalent at 6000MT/s CL30 with nearly identical latency, pick that one for Ryzen, this one for Intel.

Our verdict

Reviewed by Burooj Alam. Rated by us, not by users.

Best for

Intel Z790/Z890 builds wanting top-tier 64GB performance
Workstation and content creation rigs needing both capacity and speed

Not for

AMD Ryzen builds (use the 6000MT/s AM5-tuned version instead)

Specifications

What these specs mean

Speed Score

9.0/10

How fast this kit is among DDR5 kits, rated from its speed and latency.

Identity

Peak Bandwidth	105.6 GB/s
Brand	Corsair
Part Number	CMT64GX5M2B6600C32

Memory

DDR Generation	DDR5
Capacity	64 GB
Speed	6600 MT/s
CAS Latency	32
Module Count	2

Physical

RGB Lighting	Yes

Module and platform

RAM Segment	Desktop DDR5
Form Factor	Desktop DIMM
Platform Optimisation	Intel

Capacity

Capacity Per Module	32 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 CMT64GX5M2B6600C32 64GB (2x32GB)?

Key specs for the Corsair CMT64GX5M2B6600C32 64GB: Capacity Per Module 32 GB, Capacity 64 GB, Speed 6600 MT/s, OC Profile XMP 3.0, DDR Generation DDR5, Form Factor Desktop DIMM.

Will the Corsair CMT64GX5M2B6600C32 64GB (2x32GB) work with my current setup?

The Corsair CMT64GX5M2B6600C32 64GB (2x32GB) 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 CMT64GX5M2B6600C32 64GB (2x32GB) best suited to?

Best suited to: Intel Z790/Z890 builds wanting top-tier 64GB performance; Workstation and content creation rigs needing both capacity and speed.

What are the drawbacks of the Corsair CMT64GX5M2B6600C32 64GB (2x32GB)?

Not the best fit for: AMD Ryzen builds (use the 6000MT/s AM5-tuned version instead).