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Crucial Pro Overclocking DDR5-6400 CL40 64GB (2x32GB) specifications and in-depth review

Crucial Pro Overclocking DDR5-6400 CL40 64GB (2x32GB)

Manufacturer: Crucial

The Crucial Pro Overclocking DDR5-6400 CL40 64GB kit is a dual-module desktop memory solution built around the DDR5 standard. It comes configured as two 32GB 288-pin DIMM modules, offering a combined capacity of 64GB. With support for both Intel XMP 3.0 and AMD EXPO, the kit is designed to work with a range of modern platforms that support overclocking profiles. An integrated heatsink is included, though the modules do not feature RGB lighting.

Running at a tested speed of 6400 MHz, the kit operates with CL40 primary timings — specifically CL40-40-40-84 — and a true latency of 12.5 ns at 1.35V. The SPD-rated speed also sits at 6400 MHz. Each module holds 32GB of capacity in a standard 35 mm height profile, making it compatible with most full-size ATX and similar builds. ECC memory is not supported, and the modules do not use Samsung B-Die.

Pros
  • Supports both Intel XMP 3.0 and AMD EXPO profiles, enabling automatic configuration on a wide range of modern platforms
  • Total capacity of 64GB across two modules suits memory-intensive workloads on desktop systems
  • Integrated heatsink helps with thermal management during sustained operation
  • True latency of 12.5 ns reflects a reasonable balance between clock speed and CAS Latency at DDR5-6400
  • Standard 35 mm module height reduces the risk of clearance conflicts with CPU coolers
Cons
  • CL40 primary timings are relatively loose for a DDR5-6400 kit, which affects raw latency efficiency
  • Does not support ECC memory, limiting use in applications that require error-correcting functionality
  • No RGB lighting, which may not suit builds where visual customization is a priority
  • Does not use Samsung B-Die, which some users specifically seek out for manual overclocking headroom
Who is this for?

This kit is well suited to desktop users running memory-intensive workloads such as video editing, 3D rendering, or large dataset processing, where a combined 64GB capacity across two modules provides meaningful headroom. The dual-profile support for Intel XMP 3.0 and AMD EXPO makes it a practical choice for users on either platform who want straightforward automatic configuration without manual tuning. The integrated heatsink and standard 35 mm height also make it a reasonable fit for mid to full-tower builds where cooler clearance is not a concern.

Who is this NOT for?

Users who prioritize tight latency characteristics will find the CL40 timings less appealing, as the relatively loose primary timings reduce latency efficiency at this clock speed. The kit is also not suited to workstation or server environments that require ECC memory for error correction, since that functionality is absent. Additionally, builders who specifically seek chips with strong manual overclocking potential may find the absence of Samsung B-Die a limiting factor for pushing beyond rated specifications.

Performance:

true latency 12.5 ns
memory speed (Tested Speed) 6400
memory speed (SPD) 6400 MHz
DDR memory version 5
CAS Latency (CL) 40
tRAS timing 84
tRCD timing 40
tRP timing 40

This kit operates on the DDR5 standard with a tested speed of 6400 MHz, which also matches its SPD-rated speed. The primary timings are set at CL40-40-40-84, covering CAS Latency, tRCD, tRP, and tRAS respectively. At these settings and the module's operating voltage, the true latency works out to 12.5 ns, reflecting the relationship between the clock speed and CAS Latency value.

General info:

form factor 288-pin DIMM
memory size (total) 2 x 32GB
has Samsung B-Die ✕
voltage 1.35V
height 35 mm
memory size 32GB

The kit uses the standard 288-pin DIMM form factor and consists of two 32GB modules, bringing the total installed capacity to 64GB. Each module operates at 1.35V and measures 35 mm in height. The modules do not use Samsung B-Die.

Features:

Intel XMP / AMD EXPO Intel XMP 3.0, AMD EXPO
Supports ECC memory ✕
Has an integrated heatsink ✓
has RGB lighting ✕

The modules support both Intel XMP 3.0 and AMD EXPO profiles, allowing compatible platforms to load the rated speed and timings automatically. An integrated heatsink is included on each module. ECC memory is not supported, and the modules do not feature RGB lighting.

Benchmarks:

Final Verdict

The Crucial Pro Overclocking DDR5-6400 CL40 64GB (2x32GB) is a capable DDR5 desktop memory kit that delivers a solid combination of high capacity and broad platform compatibility through dual Intel XMP 3.0 and AMD EXPO support. Its 64GB total across two modules makes it a practical choice for users with demanding workloads, and the included heatsink along with a cooler-friendly 35 mm height add to its suitability for standard desktop builds. The CL40 timings and lack of ECC support do place some boundaries on its appeal — particularly for latency-sensitive tuners or professional error-correcting environments — but within its intended scope, it offers a well-rounded specification set for mainstream high-capacity DDR5 use.

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