4X77A77031 Lenovo 32GB 4800MHz PC5-38400 SDRAM 288-pin Cl40 Ecc Registered RDIMM Memory

Product Snapshot

Premium server memory module engineered for reliability and speed. The Lenovo 4X77A77031 is a 32GB DDR5 Registered DIMM (RDIMM) delivering 4800MHz (PC5-38400) throughput with ECC support — ideal for enterprise servers, workstations, and database hosts that require stable, high-bandwidth RAM.

Main Specifications about this Lenovo 4X77A77031

Core details

• Manufacturer: Lenovo
• Part number: 4X77A77031
• Capacity: 32GB per module
• Memory type: DDR5 SDRAM (TruDDR5/DDR5 technology)
• Frequency / Bandwidth: 4800MHz — PC5-38400
• Configuration: 1 × 32GB, dual-rank (where applicable)
• Signal: Registered (RDIMM), ECC (error-correcting)
• Pin count: 288-pin
• CAS latency: CL40 (typical)

Performance & Compatibility

System compatibility checklist

• Designed for servers and enterprise-grade motherboards that support DDR5 RDIMM modules.
• Requires BIOS/firmware that recognizes DDR5 ECC Registered modules — check vendor compatibility lists before upgrade.
• Works best in matched memory channels for optimal throughput and latency.

Use Cases

Best suited for

• Enterprise servers running virtualization or large databases.
• High-performance workstations used for CAD, simulation, and content creation.
• Data centers where fault tolerance and uptime are critical.

Highlights & Advantages

• High bandwidth: 4800MHz DDR5 for faster data transfer and improved application responsiveness.
• Reliable operation: ECC (error-correcting code) and Registered buffering to minimize crashes and data corruption.
• Server-grade form factor: 288-pin RDIMM made for compatibility with a wide range of server motherboards.
• Compact single-module option: Supplied as 1 × 32GB stick for flexible capacity scaling.

Understanding Server Memory: A Tiered Approach

Not all memory is created equal. The specifications of a memory module tell a detailed story about its intended use, performance characteristics, and reliability. To fully appreciate the capabilities of the Lenovo 4X77A77031, it's essential to understand the key differentiators in the server memory landscape.

DDR5: The Next Generation of Memory Technology

The transition from DDR4 to DDR5 is a monumental shift, offering substantial improvements that directly impact system performance and power efficiency.

Doubled Data Rates and Bandwidth

Operating at a data rate of 4800 MT/s (MegaTransfers per second), officially designated as PC5-38400, this module delivers a peak transfer rate of 38.4 GB/s per module. This is a substantial increase over standard DDR4 speeds, directly translating to faster data access for CPUs and reduced latency in data-intensive applications.

Advanced Power Management with PMIC

DDR5 introduces a fundamental architectural change by moving the Power Management Integrated Circuit (PMIC) from the motherboard to the memory module itself. This allows for more granular and stable power delivery, improving signal integrity and enabling better power efficiency, which is critical in dense server configurations where every watt counts.

Burst Length Doubled and Same Bank Refresh

DDR5 doubles the burst length from 8 to 16, which increases the efficiency of data transfer cycles. Furthermore, the "Same Bank Refresh" feature allows other banks within a memory chip to remain active and accessible while one bank is being refreshed, significantly minimizing performance bottlenecks associated with memory refresh operations.

ECC and Registered DIMMs: The Pillars of Server Stability

For any mission-critical application, data accuracy and system stability are non-negotiable. This is where ECC and Registered architecture come into play.

Error Correcting Code (ECC) for Data Integrity

ECC is a mandatory feature for servers and workstations. It can detect and correct the most common types of internal data corruption, specifically single-bit errors. As memory densities increase and cell sizes shrink, the potential for soft errors from background radiation or electrical noise also rises. ECC actively works in real-time to correct these errors, preventing system crashes, data corruption, and silent data errors that can lead to catastrophic outcomes in financial, scientific, or medical computing.

Registered DIMMs (RDIMMs) for Enhanced Reliability

The "Registered" in RDIMM indicates the presence of a register, or buffer, located between the system's memory controller and the DRAM chips. This buffer handles the electrical load, relieving the memory controller of the burden of driving all the memory chips directly. This allows a server to support a much larger quantity of memory modules and higher capacities without overloading the controller, which is essential for scalability and stability in multi-channel memory configurations. While adding a nanosecond of latency, the benefit in system integrity and capacity far outweighs the minuscule performance trade-off for enterprise use.

Lenovo 4X77A77031 Memory Module Specifications

Let's break down the complete part number and its individual components to understand exactly what this module offers.

Decoding the Part Number: 4X77A77031

Lenovo's part numbering system provides a wealth of information. While the full logic is proprietary, the key takeaway is that this alphanumeric code uniquely identifies a genuine, tested, and certified Lenovo component. Using authentic Lenovo memory ensures full compatibility, optimal performance, and preserves your system warranty.

Capacity and Speed: 32GB at 4800MHz

With a capacious 32GB per module, this DIMM provides a solid balance between density and cost-effectiveness. It allows system builders to achieve high total memory capacities (e.g., 256GB in an 8-slot system, 512GB in a 16-slot system) without the premium cost of ultra-high-density modules. The 4800MHz speed places it in the performance mainstream for current-generation DDR5 platforms, offering an excellent blend of speed, capacity, and stability for a wide range of server workloads.

Technical Form Factor: The 288-pin DIMM

The DDR5 standard utilizes a 288-pin layout, which is physically different from the 288-pin design of DDR4 modules. The key notch is in a different position to prevent accidental insertion into an incompatible motherboard. This module is a Dual In-line Memory Module (DIMM), the standard form factor for server and desktop memory.

Timing and Latency: Understanding CAS Latency 40

The CAS Latency (CL40, in this case) is the number of clock cycles it takes for the memory to return a requested piece of data after receiving the command. While a lower number is generally better, it is crucial to consider it in conjunction with the clock speed. DDR5's higher base speeds mean that even with a higher CL number, the actual latency in nanoseconds can be lower than that of DDR4. The CL40 timing on this module is optimized for the 4800MHz data rate, providing a balanced and efficient performance profile for server applications where sustained throughput is more critical than ultra-low latency.

Ideal Applications

The specific combination of features in the Lenovo 4X77A77031 makes it the ideal choice for a multitude of professional and enterprise scenarios.

Enterprise Servers and Data Centers

In virtualization environments (e.g., VMware vSphere, Microsoft Hyper-V), memory is often the primary limiting resource. This module allows for higher virtual machine density per host. For database servers (SQL Server, Oracle), large, fast, and reliable memory pools are essential for caching and in-memory processing, drastically reducing query times. File and application servers also benefit from the increased bandwidth and error-correction capabilities, ensuring uninterrupted service.

High-Performance Computing (HPC) and Workstations

Tasks such as CAD/CAM, 3D rendering, scientific simulation, and financial modeling require immense datasets to be loaded into memory. The 32GB capacity and high bandwidth of this DDR5 module accelerate these computations, while ECC guarantees the accuracy of the results, which is paramount in research and engineering.

Cloud Infrastructure and Virtualization

For cloud service providers and large-scale private clouds, hardware reliability and scalability are directly tied to profitability and service-level agreements (SLAs). The use of certified RDIMMs like the 4X77A77031 ensures that hypervisor hosts can run reliably for years, supporting hundreds of tenant VMs with a low risk of memory-related failures.