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Crucial CT64G56C46U5 DDR5-5600 64GB (1x64GB) specifications and in-depth review

Crucial CT64G56C46U5 DDR5-5600 64GB (1x64GB)

Manufacturer: Crucial

The Crucial CT64G56C46U5 is a single-module DDR5 memory kit delivering 64GB of capacity in a standard 288-pin DIMM form factor. Designed without a heatsink or RGB lighting, it keeps a low profile at 31.15 mm tall, making it a straightforward option for systems where clearance or aesthetics are secondary to raw capacity.

Running at a tested speed of 5600 MHz with a CAS latency of 46 and a true latency of 16.43 ns, the module operates at 1.1V and ships with Intel XMP 3.0 support for simplified configuration. The SPD-rated speed sits at 4800 MHz, while timings are rounded out by a tRAS of 45 and both tRCD and tRP values of 46 and 45 respectively. ECC is not supported, and the module does not use Samsung B-Die ICs.

Pros
  • A single 64GB module provides substantial capacity without occupying multiple DIMM slots
  • Intel XMP 3.0 support allows the tested speed of 5600 MHz to be enabled through a straightforward profile selection
  • The absence of a heatsink keeps the module's height at 31.15 mm, reducing the chance of clearance conflicts with large CPU coolers
  • DDR5 architecture with a 1.1V operating voltage reflects the standard low-power characteristics of the platform
Cons
  • CAS latency of 46 is relatively high for a DDR5-5600 module, which contributes to a true latency of 16.43 ns
  • No ECC support limits its suitability for workloads or platforms where memory error correction is required
  • The SPD speed of 4800 MHz means the module runs at a lower frequency out of the box without XMP enabled
  • No integrated heatsink may be a concern in thermally constrained or high-load environments
  • The kit consists of a single module, which means dual-channel configurations are not possible without an additional unit
Who is this for?

This module is well-suited for users who need high single-stick capacity — particularly those building workstations or content creation rigs where 64GB in one slot allows the remaining DIMM slots to be reserved for future expansion. Its Intel XMP 3.0 support makes it a practical choice for users on XMP-compatible platforms who want to reach 5600 MHz without manual tuning. The heatsink-free, low-profile design also makes it a reasonable fit for builds with tight cooler clearance where taller modules would be problematic.

Who is this NOT for?

This module is not a good fit for users who require ECC memory support, such as those running server-grade workloads or applications where data integrity under load is critical. Those seeking dual-channel memory configurations out of a single purchase will also find it lacking, as the kit contains only one module. Additionally, users who prioritize tight, low-latency timings — such as those tuning systems for latency-sensitive tasks — may find the CL46 timing at 5600 MHz less appealing given the resulting true latency of 16.43 ns.

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

The Crucial CT64G56C46U5 operates as a DDR5 module with a tested speed of 5600 MHz, while its SPD-rated speed sits at 4800 MHz. Its primary timings are CL46, tRCD 46, tRAS 45, and tRP 45, which translate to a true latency of 16.43 ns at the tested frequency — a figure that reflects the real-world delay experienced during memory access cycles.

General info:

form factor 288-pin DIMM
memory size (total) 1 x 64GB
has Samsung B-Die ✕
voltage 1.1V
height 31.15 mm
memory size 64GB

This module ships as a single 64GB DIMM in the standard 288-pin form factor, operating at a voltage of 1.1V. It stands 31.15 mm tall and does not use Samsung B-Die ICs.

Features:

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

The module supports Intel XMP 3.0, allowing compatible systems to load predefined memory profiles without manual timing configuration. It does not include an integrated heatsink or RGB lighting, and ECC memory is not supported.

Benchmarks:

Final Verdict

The Crucial CT64G56C46U5 DDR5-5600 is a straightforward, capacity-focused memory module that makes its strongest case in single-slot, high-capacity builds where 64GB on one DIMM is the primary objective. Intel XMP 3.0 support ensures the 5600 MHz tested speed is accessible without manual configuration, and the heatsink-free low-profile design adds a degree of physical flexibility in constrained builds. That said, its CL46 timings and lack of ECC support do define a clear boundary around its intended use — this is not a module aimed at latency-sensitive tuning or error-corrected workloads. For users whose needs align with those boundaries, the CT64G56C46U5 delivers on what it sets out to do without unnecessary complexity.

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