AD390131 Dell 128GB DDR5 6400mt/s Pc5-51200 Registered 1.1v Cl52 DDR5 SDRAM 288-pin Rdimm RAM Module For Server

Dell AD390131 128GB DDR5 6400MT/s RDIMM Server Memory Module

The Dell AD390131 128GB DDR5 registered memory module is a high-density RDIMM designed for modern rack and tower servers, delivering a combination of capacity, ECC reliability, and the higher throughput of DDR5-6400 (PC5-51200). This DIMM is commonly sold as a single 128GB RDIMM, implements ECC and registered signaling for enterprise-class error detection and signal stability, and is specified as a dual-rank x4 (2Rx4) device with CL52 timing at 1.10V operating voltage — optimized for server workloads that require large memory pools and predictable latency.

General Information

• Brand: Dell
• Part Number: AD390131 
• Product Type: 128GB DDR5 SDRAM Memory Module

Key Specifications

• Capacity: 128GB single module for large-scale memory expansion
• Technology: DDR5 SDRAM with improved bandwidth and efficiency
• Speed: 6400 MT/s (PC5-51200) for ultra-fast data transfers
• ECC Support: Error-correcting code for enhanced data accuracy
• Module Configuration: Dual Rank (2Rx4) for higher stability
• Latency: CL52 optimized for balanced performance
• Voltage: Low-power 1.1V for energy efficiency
• Form Factor: 288-pin RDIMM for enterprise-class compatibility

Optimized Server Compatibility

• Dell PowerEdge R670
• Dell PowerEdge R770
• Dell PowerEdge R6715
• Dell PowerEdge R6725
• Dell PowerEdge R7715
• Dell PowerEdge R7725

Advanced Performance Benefits

High-Speed Data Processing

With its 6400MT/s transfer rate, this DDR5 module significantly improves bandwidth, allowing applications to run smoothly and efficiently. It supports demanding workloads like virtualization, real-time analytics, and high-performance databases.

ECC Error-Correcting Capabilities

Integrated ECC functionality ensures mission-critical data is processed without corruption. This feature is essential for servers running sensitive applications, minimizing downtime and errors.

Registered Design for Stability

The registered buffer enhances signal integrity and stability, enabling better scaling in multi-module environments and reducing electrical load on memory controllers.

Dell AD390131 DDR5 Memory

Enterprise-Ready Efficiency

Offering unmatched capacity at 128GB per module, this solution allows administrators to scale server memory for virtualization clusters, heavy-duty applications, and cloud deployments.

Energy-Saving Voltage Design

Operating at 1.1V, the module balances high speed with lower energy consumption, making it an ideal choice for data centers prioritizing sustainability and cost efficiency.

Improved Latency Control

With CL52 latency, it offers improved synchronization across workloads, keeping data pipelines efficient and responsive.

Deployment Scenarios

Virtualized Environments

Expand server clusters with large memory banks to power virtual machines and container workloads without bottlenecks.

Database and Analytics

Handle in-memory database systems, data warehouses, and advanced analytics with greater stability and accelerated performance.

Additional Features for IT Professionals

Scalability and Flexibility

Whether upgrading a single server or scaling a cluster, the Dell AD390131 allows administrators to expand memory without compatibility concerns.

Longevity and Reliability

Dell-certified components guarantee rigorous testing, ensuring long-term reliability and dependable operation under continuous workloads.

Server Infrastructure Advantage

Businesses leveraging this DDR5 module gain a competitive edge with faster processing, minimized downtime, and improved overall system responsiveness.

Choose a 128GB DDR5 RDIMM like AD390131 for servers

Enterprise environments increasingly demand both capacity and bandwidth. The AD390131 offers a pragmatic balance: the 128GB module increases system memory without needing many DIMM slots, while DDR5-6400 frequency provides substantially higher sustained bandwidth than earlier DDR4 modules. For virtualization, large in-memory databases, AI/ML inference caching layers, or dense container workloads, using high-capacity RDIMMs simplifies memory subsystem design and reduces the number of modules required per system, which can also help with thermal and electrical layout in multi-socket servers. :contentReference[oaicite:1]{index=1}

Benefits for specific use cases

Virtualization

Large virtual machine (VM) hosts benefit from 128GB DIMMs because they reduce the total number of required modules while enabling higher per-host memory ceilings. Consolidating memory on fewer, larger DIMMs can simplify inventory and lower slot contention when scaling VMs horizontally across hosts.

In-memory databases and analytics

Databases that perform in-memory caching or that keep working sets resident in RAM (e.g., Redis, Aerospike, Memcached, SAP HANA) gain from both the capacity and bandwidth of DDR5-6400. The higher MT/s increases throughput for sequential and random memory accesses, improving query response times under heavy concurrency.

Technical deep dive: architecture, timings

DDR5 introduced several architectural changes versus DDR4 (on-die ECC, improved channel architecture, power management, and higher device densities). The AD390131, as a DDR5 RDIMM, leverages these improvements and is optimized for 1.10V operation at DDR5-6400 speed. Dual-rank x4 organization balances rank count with signal integrity; the x4 bus width at each device level is an industry approach to balance density and reliability in high-capacity modules. CL52 reflects the CAS latency at the target frequency — while higher numerical latency appears larger than lower-speed modules, the net effect combined with the higher transfer rate yields lower effective access time per byte in many workloads.

Because this module is ECC and registered, the memory controller receives buffered, more stable signals and the DIMM itself can correct single-bit errors and detect multi-bit errors, increasing system resiliency in long-uptime server contexts. Registered modules also include address/command buffering, which helps signal integrity at high frequencies and high DIMM population counts.

Performance considerations and real-world expectations

Raw clock speed (MT/s) is only one factor. Effective memory performance depends on memory controller behavior, interleaving, NUMA placement, application access pattern, and system configuration. DDR5-6400 delivers more peak bandwidth per channel than DDR4 or lower-speed DDR5 modules, which benefits memory-bandwidth bound workloads (e.g., large analytics scans, streaming transforms, and certain ML inference tasks). However, single-thread latency may not improve proportionally; the net benefit in real applications is workload dependent.

Comparisons Alternative 128GB DDR5 RDIMMs

128GB DDR5 RDIMMs are available from multiple vendors and in different rank/organization choices (2Rx4 vs 4Rx4) and speeds (4800 / 5600 / 6400). The AD390131 as a 2Rx4 6400MT/s RDIMM offers higher bandwidth but make sure your server supports the 6400 speed; in some configurations, a 5600 or 4800 RDIMM may be more compatible or less expensive. The choice between 2Rx4 and 4Rx4 affects platform compatibility and maximum supported ranks per channel, which matters in high DIMM population systems. For the best fit, compare the server’s validated list: choose the highest speed and rank configuration supported without violating population/rank limits. 

Happens if my server doesn't boot after installing these DIMMs

If the server fails to boot, check these sequential steps: ensure modules are seated correctly, verify they are installed in the correct slots according to the server manual, reset BIOS to defaults, and update server firmware. If issues persist, try installing a single DIMM in the primary slot to validate the module and consult Dell support with diagnostic codes and the module serial number.

Return on investment (ROI) considerations for data centers

Upgrading to high-capacity DDR5 modules can unlock denser virtualization, reduced node counts for the same memory capacity, and simplified inventory. While the initial cost per module is higher than lower capacity DIMMs, operational savings (fewer servers to manage, lower networking overhead for distributed workloads, and more efficient consolidation) often offset the hardware spend for medium and large deployments. Run a cost model that includes hardware, licensing (if per-socket), power, cooling, and management overhead to quantify ROI before large-scale rollouts.

Additional resources & validation

For final compatibility verification and technical specifications, consult Dell’s official memory upgrade pages and product listings that detail supported speeds, ranks, and server models. Reseller product pages and OEM spec sheets provide additional purchasing and part number information. When in doubt, Dell’s technical support and server documentation remain the authoritative sources for installation and compatibility guidance.