16 GB DDR4 PC4-2666V ECC RDIMM

The 16GB DDR4 PC4-2666V ECC RDIMM is a server-grade memory module engineered for enterprise servers and professional workstations running Intel Xeon Scalable Gen 1 (Skylake-SP) and Gen 2 (Cascade Lake) processors. With 2666 MT/s data rate, ECC (Error-Correcting Code) for memory error detection and correction, and Registered (buffered) architecture for high-density stability, this 16GB DDR4 RDIMM is the workhorse memory standard across Dell PowerEdge 14G servers, HPE ProLiant Gen10, HP Z6 G4 and Z8 G4 workstations, Lenovo ThinkSystem servers, and Dell Precision T5820, T7820, and T7920 workstations.

Whether you are upgrading a single workstation, expanding RAM across a server fleet, or building out a new Skylake or Cascade Lake compute environment for virtualization, database hosting, ERP applications, file serving, or rendering workloads, this 16GB DDR4-2666 ECC RDIMM delivers the proven reliability, broad compatibility, and value-for-performance that Indian IT teams rely on.

What the Module Name Means

Understanding the specification breakdown helps you confirm compatibility with your server or workstation:

• 16 GB is the capacity of one memory module
• DDR4 is the fourth-generation server and workstation memory standard
• PC4-2666V indicates DDR4 memory running at 2666 MT/s, with the "V" speed grade aligned to Intel Xeon Scalable Gen 1 (Skylake-SP) and Gen 2 (Cascade Lake)
• ECC stands for Error-Correcting Code, which detects and corrects single-bit memory errors automatically to prevent system crashes and data corruption
• Registered (RDIMM) means buffered memory with a register chip between the DRAM and the memory controller, allowing higher density and stability in multi-DIMM server configurations
• 288-pin DIMM is the standard physical form factor for DDR4 server and workstation memory

The "V" speed grade label is associated with the broadest cross-section of Xeon Scalable platforms launched between 2017 and 2020, making 2666 MT/s one of the most widely deployed DDR4 server memory speeds in the world.

Technical Specifications

• Memory Type: DDR4 ECC RDIMM (Registered DIMM with Error Correction)
• Capacity: 16 GB per module
• Speed: 2666 MT/s (PC4-2666V / PC4-21300)
• Bandwidth: Approximately 21.3 GB/s peak transfer rate
• Voltage: 1.2V (low-voltage DDR4 standard)
• Rank: Typically 2Rx4 or 1Rx4 (configuration depends on manufacturer SKU)
• CAS Latency: CL19 (CAS-19-19-19 typical)
• Error Correction: Yes, full ECC support
• Buffered: Yes, Registered (buffered) architecture
• Form Factor: 288-pin DIMM, standard DDR4 server form factor

Compatible Platforms

This 16GB DDR4 PC4-2666V ECC RDIMM is designed for enterprise servers and professional workstations running Intel Xeon Scalable 1st Generation (Skylake-SP) and 2nd Generation (Cascade Lake) processors. Officially supported platforms include:

Dell Servers and Workstations

• Dell PowerEdge 14G servers (R740, R740xd, R640, R540, T640, R940, R840, and similar)
• Dell PowerEdge 15G servers running compatible configurations (downclocks to 2666 on Gen 1 CPUs)
• Dell Precision T5820 Tower Workstation
• Dell Precision T7820 Tower Workstation
• Dell Precision T7920 Tower Workstation

HPE Servers and HP Workstations

• HPE ProLiant Gen10 servers (DL360 Gen10, DL380 Gen10, DL560 Gen10, ML350 Gen10, DL580 Gen10, and similar)
• HP Z6 G4 Tower Workstation
• HP Z8 G4 Tower Workstation

Lenovo Servers and Workstations

• Lenovo ThinkSystem SR series servers (SR630, SR650, SR850, SR550, and others)
• Lenovo ThinkStation P-series workstations with Skylake-SP or Cascade Lake support

CPU Compatibility

• Intel Xeon Scalable Gen 1 (Skylake-SP) processors including Xeon Bronze 3106, Silver 4108, 4110, 4114, 4116, Gold 5118, 5120, 6128, 6130, 6140, 6148, 6154, Platinum 8160, 8180, and other 1st-gen Scalable SKUs
• Intel Xeon Scalable Gen 2 (Cascade Lake) processors (operates at 2666 MT/s by default, can run at 2933 with Cascade Lake CPUs if all installed DIMMs are 2933 rated)
• Intel Xeon W-2100 and W-3100 series workstation processors

Always verify your motherboard's QVL (Qualified Vendor List) and memory channel population guidance before bulk ordering. Mixing 2666 and 2933 modules in the same server is allowed on Cascade Lake platforms but the entire system will run at the slower 2666 speed.

Common Brand and Part Number References

DDR4-2666 16GB ECC RDIMM modules are manufactured by major memory vendors and sold under multiple OEM part numbers. Common references include:

• HPE part numbers: 835955-B21, 838081-B21, 840757-091, 850880-001 and equivalent ProLiant Gen10 SKUs
• Dell part numbers: SNPHNDJ7C/16G, A9781928, and similar Dell-spec modules
• Lenovo part numbers: 7X77A01302, 4ZC7A08708 and equivalent ThinkSystem SKUs
• Samsung: M393A2K40CB2-CTD (2Rx4 PC4-2666V-R), M393A2K43BB1-CTD
• SK Hynix: HMA82GR7AFR8N-VK, HMA82GR7CJR8N-VK, HMA82GR7JJR8N-VK
• Micron: MTA18ASF2G72PDZ-2G6, MTA36ASF2G72PZ-2G6

All of these refer to functionally equivalent 16GB DDR4-2666 ECC Registered DIMM modules.

Key Benefits of DDR4-2666 ECC RDIMM Memory

ECC Error Correction Protects Your Workloads Single-bit memory errors caused by cosmic rays, electrical interference, or component aging are detected and corrected automatically without crashing the system. For database servers, virtualization hosts, and business-critical applications, ECC is essential.

Registered Architecture Supports High-Density Builds The register chip on RDIMM modules reduces electrical load on the memory controller, allowing you to populate more DIMMs per channel and reach memory capacities of 512GB, 1TB, or higher in a single server. Critical for in-memory databases, large VM hosts, and SAP HANA workloads.

The Widest Compatibility Sweet Spot DDR4-2666 is the maximum officially supported memory speed for Xeon Scalable Gen 1 (Skylake-SP) and a fully supported speed for Gen 2 (Cascade Lake). This makes 16GB PC4-2666V modules the single most compatible DDR4 server memory option, working across two full Intel Xeon generations and dozens of server and workstation platforms from Dell, HPE, HP, Lenovo, Supermicro, and Cisco.

Excellent Value for Refresh Cycles With newer DDR5 platforms now shipping, DDR4-2666 RDIMM pricing in India has stabilized at very competitive levels, making this an ideal moment to expand RAM in existing Skylake or Cascade Lake servers rather than replacing the entire box.

Ideal For

• Server fleet RAM upgrades and capacity expansion projects
• Workstation memory upgrades for CAD, rendering, and engineering simulation work
• Virtualization hosts running VMware ESXi, Hyper-V, KVM, and Proxmox
• Database servers running SQL Server, Oracle, MySQL, PostgreSQL, MongoDB
• ERP and CRM application servers (SAP, Microsoft Dynamics, Oracle E-Business)
• Web hosting, e-commerce, and SaaS application backends
• File and media servers with high concurrent client counts
• HPC compute clusters running scientific and engineering workloads
• IT departments standardizing memory across Dell, HPE, Lenovo, and HP fleets

DDR4-2666 vs DDR4-2933: Which Should You Buy?

If your server runs Xeon Scalable Gen 1 (Skylake-SP), DDR4-2666 is the correct choice and is the maximum speed your CPU supports. Going to 2933 modules will not improve performance because the system will downclock to 2666 anyway.

If your server runs Xeon Scalable Gen 2 (Cascade Lake), DDR4-2933 unlocks slightly higher bandwidth but DDR4-2666 still works perfectly and is often the more cost-effective choice, especially when mixing with existing inventory. Never mix 2666 and 2933 modules on the same server unless you accept the entire system running at 2666.

Why Buy 16GB DDR4 PC4-2666V ECC RDIMM from Serverindiaonline?

At Serverindiaonline, we stock genuine 16GB DDR4-2666 ECC RDIMM modules from Samsung, SK Hynix, Micron, HPE, Dell, and Lenovo OEM specifications, available in new and tested refurbished options at competitive prices in India. Every module is verified for speed, latency, and ECC functionality before dispatch through our multi-stage quality process, so you receive memory that works reliably from day one in your server or workstation.

Whether you need a single 16GB stick for a workstation upgrade or hundreds of modules to expand a data center deployment, our team helps you confirm part-number compatibility for your specific Dell PowerEdge, HPE ProLiant, HP Z-series, or Lenovo ThinkSystem platform, source matching DIMM kits, and provide bulk quotes for IT projects.

Need to expand RAM in your Skylake or Cascade Lake server or workstation? Speak to our memory specialists for the best 16GB DDR4-2666 ECC RDIMM price in India, bulk pricing for IT teams managing server fleets, and platform-specific compatibility verification before purchase.