Corsair

Corsair CMT64GX5M2B6800C40 64GB

Summary:: 64GB (2x32GB) DDR5-6800 CL40 Dominator Platinum RGB kit

Consumercarts is reader-supported. Learn more

Disclaimer: The price and specification of the given product may differ from the actual product. Please confirm on the retailer's website before buying.

Manufacturer: Corsair Last updated: 2026-09-14

Report an error

Corsair CMT64GX5M2B6800C40 64GB Review

The Corsair CMT64GX5M2B6800C40 is a 64GB (2x32GB) DDR5-6800 CL40 kit from Corsair's Dominator Platinum RGB line.

6800MT/s pushes past AM5's comfortable range, so this one's built for Intel: on a Z790/Z890 board you get 64GB of capacity plus real bandwidth headroom, at a still-decent 11.8ns true latency despite the loose-looking CL40 rating.

Performance

11.8ns true latency at 6800MT/s CL40 lands ahead of a 6000MT/s CL36 kit despite the higher CAS number, thanks to the extra bandwidth, proof that raw MT/s and CAS latency have to be read together, not separately.

Compatibility

6800MT/s is past AM5's typical sweet spot; Ryzen boards would drop to a slower 2:1 fabric ratio here, so this kit is best paired with Intel.

Comparison to Alternatives

Corsair's own CMT64GX5M2B6000Z30 stays inside AM5's sweet spot at 6000MT/s CL30 with nearly identical true latency (10.0ns), the better pick for Ryzen builds specifically.

Our verdict

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

Best for

Intel Z790/Z890 builds wanting 64GB with high bandwidth
Content creators pairing fast Intel CPUs with large memory pools

Not for

AMD Ryzen builds (stick to ~6000-6400MT/s on AM5 instead)

Specifications

What these specs mean

Speed Score

8.0/10

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

Identity

Peak Bandwidth	108.8 GB/s
Brand	Corsair
Part Number	CMT64GX5M2B6800C40

Memory

DDR Generation	DDR5
Capacity	64 GB
Speed	6800 MT/s
CAS Latency	40
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	11.8 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 CMT64GX5M2B6800C40 64GB (2x32GB)?

Key specs for the Corsair CMT64GX5M2B6800C40 64GB: Capacity Per Module 32 GB, Capacity 64 GB, Speed 6800 MT/s, OC Profile XMP 3.0, DDR Generation DDR5, Part Number CMT64GX5M2B6800C40.

Will the Corsair CMT64GX5M2B6800C40 64GB (2x32GB) work with my current setup?

The Corsair CMT64GX5M2B6800C40 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 CMT64GX5M2B6800C40 64GB (2x32GB) best suited to?

Best suited to: Intel Z790/Z890 builds wanting 64GB with high bandwidth; Content creators pairing fast Intel CPUs with large memory pools.

What are the drawbacks of the Corsair CMT64GX5M2B6800C40 64GB (2x32GB)?

Not the best fit for: AMD Ryzen builds (stick to ~6000-6400MT/s on AM5 instead).