Crucial

Crucial Ballistix MAX BLM2K8G40C18U4B

DDR Generation:: DDR4
Capacity:: 16GB (2x8GB)
Speed:: 4000MT/s
CAS Latency:: CL18
Form Factor:: Desktop DIMM
RGB Lighting:: No
Colour:: Black

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Manufacturer: Crucial Last updated: October 9, 2026

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Crucial Ballistix MAX BLM2K8G40C18U4B Review

Crucial Ballistix MAX BLM2K8G40C18U4B is a 16GB (2x8GB) DDR4-4000 kit running at CL18 timings and 1.35V, in a Desktop DIMM form factor for a desktop build.

Built for gaming and content-creation rigs, this black kit pairs 16GB (2x8GB) of DDR4 memory with tight CL18 timings so it drops in and runs at its rated speed with XMP/EXPO enabled, no manual tuning required.

Performance

Rated at 4000MT/s with CL18 latency (18-19-19-39 timings) at 1.35V, this kit is validated for stable one-click overclocking profiles on compatible motherboards.

Compatibility

Desktop DIMM form factor fits standard desktop DIMM slots on mainstream and enthusiast motherboards; confirm your board's QVL for guaranteed rated-speed operation.

Use Case

A good fit for gaming PCs, content creation rigs, and general desktop builds wanting reliable, tuned memory.

Our verdict

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

Best for

Gaming PCs
Content creation
General desktop upgrades

Not for

Laptops (wrong form factor)
ECC/server workloads

Specifications

What these specs mean

Speed Score

9.3/10

How fast this kit is among DDR4 kits, rated from its speed and latency.

Identity

Peak Bandwidth	64.0 GB/s
Brand	Crucial
Part Number	BLM2K8G40C18U4B
Series	Ballistix MAX

Memory

DDR Generation	DDR4
Capacity	16 GB
Speed	4000 MT/s
CAS Latency	18
Module Count	2
Voltage	1.35 V

Physical

RGB Lighting	No

Module and platform

RAM Segment	Desktop DDR4
Form Factor	Desktop DIMM

Capacity

Capacity Per Module	8 GB

Speed and timings

Timing String	18-19-19-39
True Latency	9.0 ns

Overclocking profile

XMP Support	Yes
XMP Version	XMP 2.0
EXPO Support	No

Silicon

Memory IC	Micron
ECC	No

Physical and lighting

Colour	Black

FAQs

What are the key specifications of the Crucial Ballistix MAX BLM2K8G40C18U4B (16GB (2x8GB)/DDR4 4000MHz/CL18/No RGB Black)?

Key specs for the Crucial Ballistix MAX BLM2K8G40C18U4B: Capacity Per Module 8 GB, Capacity 16 GB, Speed 4000 MT/s, OC Profile XMP 2.0, Voltage 1.35 V, DDR Generation DDR4.

Will the Crucial Ballistix MAX BLM2K8G40C18U4B (16GB (2x8GB)/DDR4 4000MHz/CL18/No RGB Black) work with my current setup?

The Crucial Ballistix MAX BLM2K8G40C18U4B (16GB (2x8GB)/DDR4 4000MHz/CL18/No RGB Black) lists DDR Generation is DDR4. 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 Crucial Ballistix MAX BLM2K8G40C18U4B (16GB (2x8GB)/DDR4 4000MHz/CL18/No RGB Black) best suited to?

Best suited to: Gaming PCs; Content creation; General desktop upgrades.

What are the drawbacks of the Crucial Ballistix MAX BLM2K8G40C18U4B (16GB (2x8GB)/DDR4 4000MHz/CL18/No RGB Black)?

Not the best fit for: Laptops (wrong form factor); ECC/server workloads.