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Crucial CT2K64G56C46U5 DDR5-5600 128GB (2x64GB) specifications and in-depth review

Crucial CT2K64G56C46U5 DDR5-5600 128GB (2x64GB)

Manufacturer: Crucial

Crucial's CT2K64G56C46U5 is a dual-channel DDR5 memory kit designed for desktop platforms, offering a combined capacity of 128GB across two 64GB modules. It ships in a standard 288-pin DIMM form factor without a heatsink or RGB lighting, keeping its physical profile relatively compact at 31.15 mm tall — a practical choice for systems where clearance around the CPU cooler matters.

The kit operates at a tested speed of 5600 MHz with CL46-46-45-45 timings, translating to a true latency of 16.43 ns at that frequency, while the SPD-programmed baseline sits at 4800 MHz. It carries support for both Intel XMP 3.0 and AMD EXPO profiles, allowing compatible motherboards to apply the rated 5600 MHz configuration automatically. The modules run at 1.1V, do not use Samsung B-Die ICs, and have no ECC support.

Pros
  • Supports both Intel XMP 3.0 and AMD EXPO, making it compatible with a wide range of desktop platforms without manual frequency configuration
  • Each module holds 64GB, giving the kit a total of 128GB — a substantial capacity for memory-intensive workloads
  • The compact 31.15 mm module height reduces the risk of clearance conflicts with large CPU coolers
  • Operates at 1.1V, which is the standard low-voltage range for DDR5, keeping power draw in check
  • The absence of a heatsink and RGB lighting keeps the physical design simple and unobtrusive in builds where aesthetics are not a priority
Cons
  • CAS latency of 46 is relatively high, which contributes to a true latency of 16.43 ns at the rated speed
  • The SPD default speed of 4800 MHz means the 5600 MHz rated speed is only available when XMP or EXPO is enabled on a compatible motherboard
  • No ECC support, ruling it out for use cases where memory error correction is required
  • Does not use Samsung B-Die ICs, which may matter to users who prioritize overclocking headroom beyond the rated specifications
Who is this for?

This kit is well-suited for desktop users who need large memory capacity for demanding workloads such as video editing, data processing, or virtualization, where having 128GB across two modules makes a tangible difference. It also fits builders working with both Intel and AMD platforms, since the dual XMP 3.0 and EXPO support ensures the rated 5600 MHz speed can be unlocked without manual tuning on compatible motherboards. The low-profile, heatsink-free design makes it a practical fit for systems with tighter clearance around the CPU area.

Who is this NOT for?

Users who require ECC memory — such as those running servers, workstations handling critical data, or environments where memory error correction is essential — will find this kit unsuitable, as it offers no ECC support. It is also not the right fit for enthusiasts focused on aggressive overclocking beyond rated specifications, given the absence of Samsung B-Die ICs and the relatively high CL46 timings, which leave limited headroom for pushing frequencies further. Additionally, the default SPD speed of 4800 MHz means users with motherboards that do not support XMP or EXPO will not be able to reach the advertised 5600 MHz without the appropriate platform support.

Performance:

true latency 16.43 ns
memory speed (Tested Speed) 5600
memory speed (SPD) 4800 MHz
DDR memory version 5
CAS Latency (CL) 46
tRAS timing 45
tRCD timing 46
tRP timing 45

This DDR5 kit runs at a tested speed of 5600 MHz, though its SPD-programmed default sits at 4800 MHz, meaning the higher frequency requires XMP or EXPO activation on a compatible motherboard. The primary timings are set at CL46-46-45-45 (CL, tRCD, tRAS, tRP respectively), and at 5600 MHz those figures translate to a true latency of 16.43 ns — a straightforward reflection of how the clock speed and CAS latency interact at this configuration.

General info:

form factor 288-pin DIMM
memory size (total) 2 x 64GB
has Samsung B-Die ✕
voltage 1.1V
height 31.15 mm
memory size 64GB

The kit uses the standard 288-pin DIMM form factor and consists of two 64GB modules for a total installed capacity of 128GB. Each module stands 31.15 mm tall and operates at 1.1V. The modules do not use Samsung B-Die ICs.

Features:

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

These modules support both Intel XMP 3.0 and AMD EXPO, allowing compatible motherboards to automatically apply the rated frequency and timing profile without manual configuration. The kit does not include an integrated heatsink or RGB lighting, and it has no support for ECC memory.

Benchmarks:

Final Verdict

The Crucial CT2K64G56C46U5 DDR5-5600 is a straightforward, no-frills memory kit that prioritizes high capacity and broad platform compatibility over aesthetic extras or enthusiast-grade tuning headroom. With 128GB of DDR5 across two modules and native support for both Intel XMP 3.0 and AMD EXPO, it covers a wide range of desktop builds without requiring manual configuration. Its CL46 timings and lack of ECC support do define its boundaries — this is not a kit aimed at error-correction workloads or overclocking experimentation — but for users who need a large, reliable DDR5 capacity that activates cleanly on modern platforms, the CT2K64G56C46U5 delivers exactly what its specifications promise.

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