4X77A90991 Lenovo 32GB 5600Mhz Pc5-44800 DDR5 SDRAM 288-pin Rdimm RAM Module For Server

Memory Overview

The Lenovo 32GB 5600MHz PC5-44800 DDR5 SDRAM 288-pin RDIMM RAM Module for Server is a high-performance memory solution designed to meet the demanding needs of modern data centers, enterprise environments, and servers. This DDR5 memory module offers exceptional speed, capacity, and reliability, making it an ideal choice for upgrading or building powerful server systems that require intensive memory capabilities. Below, we will explore the technical specifications, key features, compatibility, installation tips, and performance advantages of this Lenovo RAM module in great detail.

Main Information

• Brand : Lenovo 
• Part Number: 4X77A90991
• Type: 32GB DDR5 RDIMM

Technical Feature of RAM

• Capacity: 32GB
• Memory Type: DDR5
• Data Rate: 5600MHz
• Form Factor: 288-pin RDIMM (Registered Dual Inline Memory Module)
• Module Type: Server-grade RDIMM
• Memory Voltage: 1.1V
• Latency: CAS latency of 40 (CL40)
• Module Rank: Dual Rank
• Bus Type: PC5-44800
• Model Number: 4X77A90991

Virtualization & Cloud Hosts

• Supports large virtual machine densities per host by combining high capacity and ECC protection.
• Dual-rank modules can improve memory interleaving for hypervisor workloads.

Database & In-Memory

• High sustained bandwidth is advantageous for read/write intensive databases and in-memory analytics engines.
• ECC reduces the probability of silent data corruption, a critical requirement for database integrity.

High Performance Computing (HPC)

• Works well in compute clusters that require predictable memory performance across many nodes.
• Registered modules enable stable operation with large total memory footprints per server.

Performance Advantages

The 4X77A90991 module is purpose-built for workload-intensive server environments. Its DDR5 architecture increases per-channel bandwidth, while the RDIMM registration and ECC support provide robust data integrity under sustained load. Below are performance and reliability benefits that make this module suitable for enterprise deployments.

Operating at 1.1 V, this DDR5 module reduces power draw compared to legacy DDR generations at higher voltages. Lower operating voltage helps reduce overall server power usage and thermal load, which is particularly valuable in dense rack deployments and energy-sensitive data centres.

Before purchasing, verify motherboard and platform support for DDR5 RDIMMs and specific speeds. LENOVO’s part number 4X77A90991 is primarily targeted at Lenovo server platforms but may also be compatible with other vendors’ servers that accept DDR5 RDIMM ECC modules — provided the platform firmware and memory training routines support the module’s speed and rank configuration.

Security & Reliability

Enterprise modules such as the 4X77A90991 typically undergo strict manufacturing and testing processes to meet server reliability standards. While specific compliance marks vary by vendor and batch, look for manufacturing test records and vendor warranties when procuring for critical environments.

Technical Glossary & Terminology

DDR5

The fifth generation of Double Data Rate Synchronous DRAM, delivering increased bandwidth, improved power efficiency and new on-die features compared to DDR4.

RDIMM

Registered Dual Inline Memory Module — uses a register to buffer command and address lines, improving signal integrity for high-density server configurations.

ECC

Error-Correcting Code — a memory technology that detects and corrects certain types of memory errors to prevent data corruption.

MT/s

Million Transfers per second — commonly used to express effective DDR memory speed (e.g., 5600 MT/s).

CL (CAS Latency)

Column Address Strobe latency — the number of clock cycles between a command and the availability of data; lower numbers mean fewer cycles, but effective throughput depends on the combination of latency and clock rate.

Compatibility and Platform Considerations

Before purchasing, verify compatibility with your server platform and CPU memory controller. DDR5 RDIMM support depends on the server's chipset and the CPU generation. Lenovo branded modules such as the 4X77A90991 are tested for specific Lenovo ThinkSystem servers and OEM platforms, but they also typically conform to JEDEC standards that make them compatible with a wider range of validated OEM server models—provided the platform supports RDIMM DDR5, 5600 MT/s operating points and registered memory topologies.

BIOS/UEFI and SPD

Modules expose SPD (Serial Presence Detect) parameters which the platform BIOS uses to set default timings and voltages. Servers commonly provide XMP-like profiles or platform tuned memory profiles; confirm your server BIOS version supports 5600 MT/s timing profiles for dual rank RDIMMs. Updating BIOS/firmware may be necessary to unlock higher speeds or improved stability.

Populate Strategically

Memory population rules differ by server. Follow the motherboard/server vendor’s memory population guidelines to balance channels and ranks. Proper population ensures optimal interleave and maximizes memory bandwidth. For many dual-socket servers, populate equivalent DIMM capacities across CPU sockets to maintain balanced NUMA performance.

Mixing Memory

Avoid mixing JEDEC-standard RDIMMs with modules that have different voltages, ranks, or non-registered (UDIMM) modules in the same channel. Mixing can cause the system to down-clock to the slowest module’s speed, or prevent booting entirely. For best reliability and predictable performance, match capacity, rank, speed and manufacturer where possible.

Reliability, Testing, and Quality Assurance

Enterprise-Grade Testing

Lenovo-branded server memory undergoes enterprise testing that typically includes burn-in, signal integrity verification, parity/ECC validation and thermal cycling. This category emphasizes modules designed for 24/7 availability with error detection and correction mechanisms critical for business continuity.

ECC and Data Integrity

ECC in RDIMM modules corrects single-bit errors and detects multi-bit errors. In enterprise environments, ECC reduces silent data corruption and helps preserve database and filesystem integrity. Paired with registered buffering, ECC supports large memory configurations that would otherwise compromise signal quality.

Warranty and Support Options

Lenovo memory modules often include enterprise warranties and support entitlements, such as limited lifetime or multi-year warranties, and options to exchange failed modules through OEM support channels. For organizations that require guaranteed SLAs, purchasing genuine Lenovo modules from authorized channels ensures access to vendor support and firmware compatibility guarantees.

SPD Security

Memory modules use SPD data to convey configuration; ensure firmware patches are applied to server platforms to mitigate any SPD spoofing or configuration issues. While memory modules themselves are passive, firmware controls can ensure correct timing and secure boot compatibility.

Regulatory and Environmental Compliance

Enterprise memory should comply with environmental and regulatory standards (RoHS, WEEE where applicable) and often comes with manufacturer declarations. For procurement teams, confirm compliance certifications if required for tender responses or corporate sustainability reports.

Common causes include incompatible DIMM type (UDIMM vs RDIMM), mismatched ranks, incorrect population order, or unsupported speed for CPU/motherboard. Revert to prior configuration, update BIOS, and ensure identical modules populate symmetric channels.

Observed Corrected ECC Errors

Occasional corrected ECC errors can be expected in active datacenter environments; however, frequent corrected errors may signal a marginal module, a failing DIMM slot, or electrical/interference issues. Track error trends—replace modules with consistent corrected errors and validate chassis airflow and power stability.

Speed Downclocking to a Lower Frequency

If the system runs modules at a lower frequency, the cause is typically either the memory controller limiting speed for stability or the presence of a slower mixed module. Ensure BIOS settings are configured for highest JEDEC/XMP profile and verify all populated DIMMs support the target speed.

Case Uses

Small Business Server Upgrade

Upgrading existing servers with 32GB DDR5 RDIMMs can significantly increase virtual machine density or database cache while avoiding full server replacement. Use balanced population to maximize bandwidth and maintain NUMA symmetry in dual-socket deployments.

Large Scale Datacenter Rollout

For fleet upgrades, standardize on a single validated SKU such as Lenovo 4X77A90991 to simplify inventory, supportability and lifecycle management. Pre-validation, burn-in and vendor support contracts are recommended for large deployments.

High Availability & Fault Tolerant Builds

In HA pairs or clusters, identical memory across nodes minimizes variability and reduces risk of subtle performance differences that complicate troubleshooting. For mission critical systems, prefer OEM modules covered by vendor SLAs.