4X77A94006 Lenovo 64GB DDR5 4800Mhz Pc5-38400 Dual Rank X4 Ecc Registered 1.1v Cl40 SDRAM 288-pin Rdimm RAM Module For Server

Overview of the 64GB DDR5 4800MHz Memory Module

The Lenovo 4X77A94006 64GB DDR5 RDIMM is designed for professional server applications requiring fast speeds, enhanced reliability, and dependable scalability. This module leverages DDR5 SDRAM technology to deliver exceptional bandwidth, optimized latency, and reliable error correction to support business-critical workloads.

General Information

• Manufacturer: Lenovo
• Part Number: 4X77A94006
• Memory Capacity: 64GB (1 x 64GB module)

Key Features and Specifications

• Memory Standard: DDR5 SDRAM, PC5-38400
• Speed: 4800MHz
• Data Integrity: ECC (Error-Correcting Code)
• Module Type: Registered DIMM (RDIMM)
• Rank Configuration: Dual Rank x4
• CAS Latency: CL40
• Voltage: 1.1V
• Pin Count: 288-pin RDIMM

Compatibility

This memory module is built to meet the needs of advanced servers and workstations that demand reliability under continuous workloads. Its compatibility with enterprise-grade Lenovo servers makes it an essential component for IT infrastructures seeking higher efficiency.

• Virtualized environments and cloud computing clusters
• High-performance database servers
• AI and machine learning workloads
• Financial modeling and real-time analytics
• Large-scale scientific computing and engineering simulations

Compatibility and Platform Alignment

As a Lenovo-qualified part, 4X77A94006 integrates seamlessly with supported ThinkSystem/ThinkAgile servers and their qualified CPU generations. Compatibility is essential: while DDR5 RDIMMs share a common 288-pin form factor, timing parameters, SPD profiles, and power delivery expectations are vendor-tuned. Use the correct FRU/PN to maintain warranty compliance and ensure BIOS/UEFI recognizes JEDEC and vendor-specific timing tables correctly.

Advantages of Lenovo 64GB DDR5 4800MHz ECC Registered Memory

This high-performance DDR5 module ensures smoother multitasking, reduced latency, and improved throughput compared to DDR4 counterparts. Its ECC functionality safeguards against data corruption, making it ideal for mission-critical environments such as data centers, virtualization clusters, and enterprise-grade applications.

Registered ECC Memory

Registered DIMMs with ECC technology bring stability and consistency to server platforms. By reducing electrical load on the memory controller, RDIMMs allow greater scalability with multiple modules installed, ensuring enhanced performance for compute-intensive tasks.

Performance-Oriented Design

The Lenovo 64GB DDR5 4800MHz RDIMM is engineered to handle the growing demands of high-performance computing. With faster data rates and optimized bandwidth, it ensures smooth execution of applications such as AI processing, scientific simulations, and enterprise-scale databases.

Reliability and Longevity

Built to enterprise specifications, the Lenovo 4X77A94006 memory module provides long-term stability with ECC protection and advanced signal processing. Businesses relying on high uptime benefit from its ability to reduce crashes, data corruption, and performance bottlenecks.

Lenovo 64GB DDR5 4800MHz PC5-38400 288-Pin RDIMM 

The Lenovo 4X77A94006 is a high-capacity, enterprise-grade DDR5 RDIMM designed for modern Lenovo ThinkSystem and ThinkAgile servers that require dependable throughput, tighter timing control, and robust RAS (Reliability, Availability, Serviceability) features. With a native data rate of 4800 mega-transfers per second (MT/s), low 1.1V operating voltage, and ECC Registered architecture, this 64GB module helps administrators consolidate workloads, accelerate databases, feed CPU cores for virtualization, and future-proof memory footprints. The Dual Rank x4 topology, on-DIMM power management, and on-die ECC enable consistent performance under sustained load while protecting against transient and permanent memory errors. This page explores the broader category and subcategory of enterprise DDR5 RDIMMs with a specific focus on model 4X77A94006, addressing performance tuning, configuration rules, best practices, and deployment scenarios in production environments.

DDR5 RDIMM Advances Server Memory Architecture

DDR5 introduces substantial architectural changes compared to DDR4, enabling higher bandwidth per pin, improved efficiency, and better signal integrity. For administrators standardizing on the Lenovo 4X77A94006, these advances translate to higher consolidation ratios, faster query execution, and more predictable tail latencies in mixed workloads.

Independent 32-Bit Sub-Channels

Unlike DDR4’s single 64-bit channel per DIMM, DDR5 splits the DIMM into two independent 32-bit sub-channels (plus ECC). This improves concurrency and command efficiency by allowing the memory controller to interleave requests at a finer granularity. The result is reduced queuing, shorter access times under contention, and better real-world throughput—benefits that are particularly noticeable when multiple vCPUs or microservices hit the memory subsystem concurrently.

On-DIMM Power Management (PMIC)

DDR5 migrates power regulation from the system board to each DIMM via an integrated PMIC. This localizes noise sources, improves voltage delivery accuracy, and reduces motherboard complexity. For the Lenovo 4X77A94006, the PMIC helps maintain stable 1.1V operation across thermal swings and power events, which is essential for 24×7 environments and tight uptime SLAs.

On-Die ECC and Enhanced RAS

DDR5 devices incorporate on-die ECC that corrects single-bit errors within each DRAM chip before data leaves the die. When combined with module-level ECC and the Registered buffer, the overall error-handling pipeline becomes more resilient. This layered protection is critical for memory-intensive services where silent data corruption or kernel panics would be unacceptable.

Performance 

The 2Rx4 layout of the Lenovo 4X77A94006 balances rank count and device width to deliver strong throughput while keeping error containment tight. Dual Rank modules can provide higher effective bandwidth in many memory controllers by enabling rank interleaving, which keeps more banks active and helps hide DRAM precharge/activate penalties.

Latency, Bandwidth, and Real-World

While CL40 may numerically appear higher than older DDR generations, the faster base clock and improved architecture compensate in practice. Effective throughput scales with transfer rate (4800MT/s), and DDR5’s command efficiency often offsets nominal CAS latency comparisons. In real deployments—think OLTP databases, in-memory caches, and containerized analytics pipelines—the measured application-level gains are driven by sustained bandwidth, reduced queueing, and better parallelism rather than headline CAS alone.

Reliability, Availability, and Serviceability (RAS) in Focus

Mission-critical platforms depend on deterministic behavior. The Lenovo 4X77A94006 employs ECC, parity, and Registered buffering to stabilize large memory configurations, reduce signal loading on the memory controller, and isolate faults.

Error Detection and Correction Path

With x4 devices, single-chip data errors can be isolated more effectively. In addition to on-die ECC, the DIMM’s ECC parity line and server firmware collaborate to detect, log, and correct transient events. Correctable errors are handled seamlessly while uncorrectable events are escalated through system logs (SEL/IMM/iLO equivalents depending on platform), enabling proactive DIMM replacement before workload impact.

Fault Isolation and Predictive Alerts

Modern Lenovo servers expose predictive failure analysis via firmware and management suites. Memory thermal sensors, voltage telemetry from the PMIC, and ECC counters provide early warning indicators. Administrators can set thresholds to trigger alerts, service tickets, or automatic remediation workflows.

Power Efficiency

Operating at 1.1V, DDR5 draws less power at a given data rate compared with DDR4, especially when factoring in higher performance per watt. The 4X77A94006’s PMIC and improved I/O drivers contribute to lower heat generation and more consistent thermals across the memory channel.

Capacity Planning

Memory topology (channels, ranks, and population order) directly affects bandwidth and latency. To extract maximum performance from 4800MT/s RDIMMs, follow Lenovo population guidelines, match module speeds, and balance ranks across CPU sockets. Mixed population is possible in many systems but may down-clock to the lowest common denominator—the safest path for deterministic performance is to standardize on identical part numbers within a node.

Single vs. Dual vs. Quad-Channel Per CPU

Most modern server CPUs expose multiple memory channels per socket (e.g., 8 or 12). Utilize symmetrical channel filling—1 DIMM per channel (1DPC) typically yields the highest speed; 2DPC and 3DPC may reduce the data rate but increase capacity. For virtualization clusters, evaluate whether higher frequency at 1DPC or more capacity at 2DPC delivers better SLA adherence for your specific workload mix.

Rank Interleaving Benefits

Dual Rank modules like the Lenovo 4X77A94006 allow the memory controller to interleave between ranks, improving concurrency and throughput. In practice, two 2Rx4 DIMMs per channel often outperform a single higher-capacity 1Rx4 module in mixed read/write patterns, assuming the platform sustains the target speed.

Operating System and Hypervisor Notes

Enterprise Linux distributions, Windows Server editions, and hypervisors such as VMware ESXi, Microsoft Hyper-V, Proxmox VE, and KVM benefit from fast, error-corrected memory. Ensure NUMA alignment: pin memory resources to the same socket as the vCPUs to minimize remote access latency in multi-socket nodes.

Use Cases 

The 64GB DDR5 4800MT/s RDIMM is a versatile building block for standardized memory kits across small clusters and large private clouds. Teams can right-size nodes for general-purpose virtualization, memory-resident caches, and analytics frameworks without sacrificing reliability.

Database and Analytics

Relational databases (OLTP/OLAP) and distributed data platforms (Spark, Presto, Trino) thrive on large, low-latency memory pools. Data shuffles, hash joins, and columnar scans benefit from DDR5’s sub-channel parallelism and improved prefetch behavior. With 64GB increments, you can scale per-socket capacity predictably while keeping channels balanced.

Virtual Desktop Infrastructure (VDI)

VDI demands consistent response times for thousands of sessions. The 4X77A94006 helps stabilize frame buffer caching, profile loading, and application spawns during login storms. Dual Rank organization aids in smoothing contention during morning ramp-ups and patch windows.

Edge and ROBO Deployments

Remote offices and edge data centers rely on compact nodes that must be both robust and power-efficient. DDR5 at 1.1V reduces thermal stress in shallow-depth racks, while ECC and Registered buffering protect against noise and voltage irregularities more common in constrained environments.

Security, Data Integrity, and Compliance

While memory modules do not store persistent data after power loss, runtime integrity is critical. ECC reduces the risk of memory-resident malware causing undetected corruption. When combined with secure boot, runtime attestation, and timely patching, the memory subsystem supports overall platform trust. For compliance-sensitive industries—finance, healthcare, public sector—error-corrected memory is often a mandated baseline for production workloads and audit checklists.

Sustainability and Lifecycle Considerations

Adopting DDR5 1.1V modules contributes to better performance per watt, enabling consolidation—fewer nodes delivering the same service level. This reduces power draw, cooling requirements, and rack footprint over the product lifecycle. Standardizing on a single 64GB Lenovo FRU streamlines sparing, lowers inventory complexity, and reduces logistics emissions.

Refresh Planning

When planning multi-year rollouts, evaluate memory roadmaps: higher-speed bins and 128GB/192GB RDIMMs may appear for future nodes. The 64GB 4800MT/s 2Rx4 tier remains a sweet spot for cost, capacity, and bandwidth, fostering compatibility across multiple server generations.

General-Purpose Virtualization

For mixed VM pools (web, API, light DB), aim for 1DPC with 64GB RDIMMs for highest speed, then expand to 2DPC as density grows. Use QoS policies to cap outlier VMs and maintain headroom for patching and live migrations.

High-Performance Computing (HPC) and Analytics

HPC codes with larger working sets benefit from the 2Rx4 structure and DDR5 bandwidth. Ensure MPI ranks and data partitions are NUMA-local. Consider huge pages and tuned schedulers to keep memory residency high.

Enterprise Databases

Scale buffer pools in 64GB increments; distribute memory equally across sockets to avoid remote access penalties. Enable ECC logging to track correctable errors and schedule proactive maintenance during maintenance windows.