KCS-UC564D4-128G Kingston 128GB DDR5 6400MT/s ECC RAM Module

Product Overview — KINGSTON KCS-UC564D4-128G 128GB DDR5-6400 DIMM

KINGSTON KCS-UC564D4-128G is a high-performance 128 GB DDR5 memory module engineered for enterprise servers and workstations that demand ultra-fast throughput, dependable error correction and power-efficient operation. This registered, dual-rank DIMM conforms to the DDR5-6400 / PC5-51200 standard with 288 pins and operates at 1.10 V for optimized stability.

Key Specifications

• Model: KCS-UC564D4-128G
• Capacity: 128 GB (gigabytes)
• Memory Type: DDR5 SDRAM
• Speed: 6400 MT/s (DDR5-6400 / PC5-51200)
• CAS Latency: CL52
• Voltage: 1.10 V (low-voltage operation)
• Topology: Dual-rank
• Error Handling: ECC (error-correcting code)
• Buffering: Registered (RDIMM)
• Form Factor: 288-pin DIMM
• Part Number: KCS-UC564D4-128G

Performance & Reliability

Blazing Throughput for Intensive Workloads

This 128GB DDR5-6400 module delivers exceptional bandwidth and lower latency for data-heavy tasks. With a rated transfer rate of 6400 MT/s, it accelerates memory-bound applications such as large-scale virtualization, high-frequency data processing, in-memory databases and scientific simulations.

Enterprise-Grade Error Correction

Built with ECC support and registered buffering, the module detects and corrects bit-level errors to prevent data corruption and system crashes—an essential feature for mission-critical servers and business continuity.

Dual-Rank Advantages

The dual-rank configuration increases effective memory parallelism and can improve overall throughput on platforms that favor rank interleaving, offering better performance under multi-threaded and multi-process server loads.

Compatibility & Platform Support

Systems & Motherboards

• Designed for DDR5-capable server and workstation platforms that accept 288-pin RDIMM modules.
• Compatible with enterprise-grade CPUs and chipsets that officially support DDR5-6400 speeds (verify motherboard QVL for guaranteed interoperability).

Use Cases

• Virtualization hosts running many VMs or containers
• High-performance computing (HPC) clusters and compute nodes
• Database servers (in-memory and OLTP/OLAP workloads)
• Content creation and rendering farms
• Large-scale caching and analytics platforms

Design & Power Efficiency

Low-Voltage Operation

Operating at 1.10 V, the KCS-UC564D4-128G reduces power consumption while maintaining high frequency and stability—helpful for data center environments where energy efficiency and thermal management matter.

Thermal and Electrical Stability

• Registered architecture reduces electrical load on the memory controller for enhanced signal integrity.
• Dual-rank layout distributes access patterns to minimize hot spots and improve sustained throughput.

Product Focus: Kingston KCS-UC564D4-128G 128GB DDR5-6400/PC5-51200 SDRAM Dual-rank

The Kingston KCS-UC564D4-128G 128GB DDR5-6400/PC5-51200 SDRAM 6400MT/s Dual-rank CL52 1.10V ECC 288-pin DIMM RAM Module represents a high-capacity, high-throughput memory solution engineered for modern servers, workstations, and compute-dense environments. This category page focuses on the technical attributes, real-world applications, compatibility considerations, deployment best practices, and buying guidance for this family of DDR5 ECC registered memory modules.

Key Specifications and What They Mean

Understanding the core specifications of the Kingston KCS-UC564D4-128G is essential for matching the module to the right system and workload. Below is a breakdown of the most load-bearing technical details and their practical implications.

Memory Type and Speed

• DDR5-6400 / PC5-51200: Denotes the generation (DDR5) and the data transfer rate (6400 MT/s), corresponding to theoretical peak bandwidth of PC5-51200. Faster transfer rates improve throughput for memory-bound applications such as in-memory databases, virtualization hosts, and scientific simulations.
• 6400 MT/s: Optimized for next-generation CPUs and platforms that support higher memory frequencies, enabling lower latency per operation when paired with matching system support.

Capacity and Physical Form Factor

• 128GB per module: High-density single-module capacity allows for very large memory footprints with fewer DIMM slots occupied—critical for multi-socket servers or compact rack designs.
• 288-pin DIMM: Standard form factor for server-class DDR5 RDIMMs/UDIMMs; ensures compatibility with motherboards and systems designed for ECC registered or load-reduced DDR5 modules.

Dual-Rank and ECC

• Dual-rank architecture: Two ranks per module can increase memory parallelism and improve performance on certain platforms. Dual-rank modules often deliver better effective throughput compared to single-rank modules in multi-channel systems.
• ECC (Error-Correcting Code): On-module ECC provides automatic detection and correction of single-bit memory errors—a must for enterprise, mission-critical, and data integrity-focused deployments.

Timing and Voltage

• CAS Latency CL52: The latency metric at DDR5-6400; CL52 is a design trade-off between clock frequency and latency. While higher frequencies increase bandwidth, latency should be considered for latency-sensitive workloads.
• Operating Voltage 1.10V: DDR5 logic and power delivery improvements allow lower operating voltages compared to earlier generations, improving power efficiency at scale.

Performance Characteristics and Workload Fit

The Kingston KCS-UC564D4-128G is tailored for workloads that benefit from very high aggregate memory capacity combined with elevated bandwidth. This includes:

• Virtualization hosts (dense VM consolidation)
• In-memory databases and caching layers
• High-performance computing (HPC) and scientific modeling
• AI/ML model training and inference nodes where large datasets are kept in memory
• Large-scale analytics and real-time data processing

When selecting memory for these workloads, system architects prioritize both capacity and sustained throughput. Dual-rank, high-density modules like the 128GB DDR5-6400 provide a balance—offering sizable memory pools while leveraging DDR5’s increased channel-level efficiency.

Comparing Throughput vs. Latency

Two core performance dimensions matter: raw bandwidth (throughput) and access latency. DDR5-6400 emphasizes bandwidth—beneficial for parallel, streaming workloads that move large data blocks quickly. However, the CL52 latency figure is relatively higher in absolute clock cycles than lower-frequency modules with lower CAS numbers; therefore:

• For applications bound by bandwidth (e.g., large dataset scanning), DDR5-6400 yields measurable gains.
• For ultra-latency-sensitive transactions (microservices, ultra-low-latency trading stacks), architects should test end-to-end latency in the target environment and consider configuration trade-offs (channel population, interleaving, CPU memory controller behavior).

Compatibility and Platform Support

Ensuring the Kingston KCS-UC564D4-128G is supported by your server or motherboard is crucial. Compatibility considerations include memory type (RDIMM vs UDIMM vs LRDIMM), ECC support, BIOS/UEFI firmware readiness, and CPU memory controller capabilities.

System Requirements

• Motherboard must support DDR5 ECC memory and the 288-pin DIMM form factor.
• Server CPUs and memory controllers should support DDR5-6400; otherwise, modules will operate at the highest mutually supported frequency.
• BIOS/UEFI should include validated SPD/XMP/JEDEC profiles for DDR5-6400 modules; firmware updates may be required for optimal stability.

Registered vs Unbuffered

Confirm whether the target system requires Registered DIMMs (RDIMM) or Load-Reduced DIMMs (LRDIMM). Kingston’s enterprise lineup offers ECC Registered modules designed for server-class motherboards. Mismatched DIMM types (e.g., mixing RDIMM and UDIMM) will not work and can prevent boot.

Population Guidelines

• Follow the motherboard/vendor memory population guidelines for channel interleaving (populate identical modules across channels for best throughput).
• Use matched capacity and rank configurations across channels to maintain symmetrical performance and avoid down-clocking.
• For dual-socket systems, ensure balanced DIMM counts per CPU for consistent latency and bandwidth.

Reliability, Availability, Serviceability (RAS) Features

Enterprise memory requirements extend beyond speed and capacity—reliability features such as ECC and thermal management are critical. The Kingston KCS-UC564D4-128G includes ECC to detect and correct single-bit errors automatically, reducing silent data corruption risks.

E2E Data Path Protection and ECC Importance

E2E (end-to-end) data path protection ensures that data errors are caught across the entire memory subsystem—from the CPU memory controller through the DIMM back to system memory. ECC is essential in environments where data integrity is paramount, including financial services, governmental records, scientific data centers, and medical imaging.

Testing, Validation and Benchmarking

Real-world validation is non-negotiable for enterprise memory deployments. Run both synthetic benchmarks and workload-based tests to verify performance and stability.

Recommended Test Suite

• Memtest or vendor-provided memory diagnostics (for ECC validation and error detection).
• STREAM or equivalent bandwidth benchmarks to measure sustained memory throughput.
• Application-level benchmarks (database OLTP/OLAP, virtualization consolidation tests, AI training epochs) to quantify end-user impact.

Interpreting Benchmark Results

When evaluating results, compare both single-threaded and multi-threaded scenarios, and measure tail latency as well as average throughput. DDR5’s benefits are most visible in multi-threaded, high-concurrency environments where aggregate bandwidth is the limiting factor.

Purchase Considerations and Total Cost of Ownership (TCO)

Buying high-density Kingston DDR5 modules requires balancing initial costs against savings achieved through consolidation, performance, and reduced management overhead. Key TCO factors include:

• Memory price per GB and expected module longevity
• Energy costs driven by power usage at scale
• Cooling infrastructure changes required for denser memory populations
• Operational savings from improved VM density or reduced storage I/O

Related Products and Upgrades

When building or expanding a memory configuration, also consider complementary Kingston products such as lower latency modules for latency-sensitive workloads, or LRDIMM variants when the platform supports higher total capacity per socket. Evaluate matched kits to ensure rank and timing symmetry across channels.

Closing Technical 

Kingston KCS-UC564D4-128G 128GB DDR5-6400/PC5-51200 SDRAM modules are a strategic choice for environments demanding large in-memory capacity, high sustained bandwidth, and enterprise-class data integrity. While raw specifications give an initial performance expectation, the true value is realized through careful platform validation, balanced population strategies, and robust monitoring. When deployed according to vendor guidelines, these modules can significantly raise application performance ceilings while maintaining the reliability enterprises require.

Further Reading and Resources

• Consult your server vendor’s memory and BIOS update documentation for validated support lists and population rules.
• Follow Kingston’s product datasheet and technical notes for SPD/XMP profile details and warranty coverage.
• Run platform-specific benchmarks (STREAM, application-level tests) to quantify gains before mass deployment.

Technical Keywords for Search Optimization

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